mirror of
git://sourceware.org/git/glibc.git
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Remove private information from libc-lock.h
This commit is contained in:
Ulrich Drepper
parent
a000466f5e
commit
9463518d0d
@ -1,3 +1,9 @@
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2012-03-06 Ulrich Drepper <drepper@gmail.com>
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* sysdeps/pthread/bits/libc-lock.h: Split information not needed in
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installed headers...
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* sysdeps/pthread/bits/libc-lockP.h: ...here. New file.
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2012-03-06 David S. Miller <davem@davemloft.net>
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* sysdeps/unix/sysv/linux/sparc/sem_post.c (__new_sem_post): Use
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@ -6,8 +12,8 @@
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2012-02-27 David S. Miller <davem@davemloft.net>
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* sysdeps/unix/sysv/linux/i386/bits/pthreadtypes.h: Don't refer to non-existing
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__pthread_attr.
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* sysdeps/unix/sysv/linux/i386/bits/pthreadtypes.h: Don't refer to
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non-existing __pthread_attr.
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* sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h: Likewise.
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* sysdeps/unix/sysv/linux/s390/bits/pthreadtypes.h: Likewise.
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* sysdeps/unix/sysv/linux/sh/bits/pthreadtypes.h: Likewise.
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@ -24,42 +24,17 @@
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#include <stddef.h>
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/* Fortunately Linux now has a mean to do locking which is realtime
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safe without the aid of the thread library. We also need no fancy
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options like error checking mutexes etc. We only need simple
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locks, maybe recursive. This can be easily and cheaply implemented
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using futexes. We will use them everywhere except in ld.so since
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ld.so might be used on old kernels with a different libc.so. */
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#ifdef _LIBC
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# include <lowlevellock.h>
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# include <tls.h>
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# include <pthread-functions.h>
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#endif
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/* Mutex type. */
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#if defined _LIBC || defined _IO_MTSAFE_IO
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# if (defined NOT_IN_libc && !defined IS_IN_libpthread) || !defined _LIBC
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typedef pthread_mutex_t __libc_lock_t;
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typedef struct { pthread_mutex_t mutex; } __libc_lock_recursive_t;
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# else
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typedef int __libc_lock_t;
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typedef struct { int lock; int cnt; void *owner; } __libc_lock_recursive_t;
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# endif
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typedef struct { pthread_mutex_t mutex; } __rtld_lock_recursive_t;
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# ifdef __USE_UNIX98
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typedef pthread_rwlock_t __libc_rwlock_t;
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# else
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typedef struct __libc_rwlock_opaque__ __libc_rwlock_t;
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# endif
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#else
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typedef struct __libc_lock_opaque__ __libc_lock_t;
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typedef struct __libc_lock_recursive_opaque__ __libc_lock_recursive_t;
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typedef struct __libc_rwlock_opaque__ __libc_rwlock_t;
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#endif
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/* Type for key to thread-specific data. */
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typedef pthread_key_t __libc_key_t;
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/* Define a lock variable NAME with storage class CLASS. The lock must be
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initialized with __libc_lock_init before it can be used (or define it
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with __libc_lock_define_initialized, below). Use `extern' for CLASS to
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@ -67,44 +42,8 @@ typedef pthread_key_t __libc_key_t;
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definitions you must use a pointer to the lock structure (i.e., NAME
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begins with a `*'), because its storage size will not be known outside
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of libc. */
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#define __libc_lock_define(CLASS,NAME) \
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CLASS __libc_lock_t NAME;
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#define __libc_rwlock_define(CLASS,NAME) \
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CLASS __libc_rwlock_t NAME;
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#define __libc_lock_define_recursive(CLASS,NAME) \
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CLASS __libc_lock_recursive_t NAME;
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#define __rtld_lock_define_recursive(CLASS,NAME) \
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CLASS __rtld_lock_recursive_t NAME;
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/* Define an initialized lock variable NAME with storage class CLASS.
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For the C library we take a deeper look at the initializer. For
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this implementation all fields are initialized to zero. Therefore
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we don't initialize the variable which allows putting it into the
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BSS section. (Except on PA-RISC and other odd architectures, where
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initialized locks must be set to one due to the lack of normal
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atomic operations.) */
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#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
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# if LLL_LOCK_INITIALIZER == 0
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# define __libc_lock_define_initialized(CLASS,NAME) \
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CLASS __libc_lock_t NAME;
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# else
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# define __libc_lock_define_initialized(CLASS,NAME) \
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CLASS __libc_lock_t NAME = LLL_LOCK_INITIALIZER;
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# endif
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#else
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# if __LT_SPINLOCK_INIT == 0
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# define __libc_lock_define_initialized(CLASS,NAME) \
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CLASS __libc_lock_t NAME;
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# else
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# define __libc_lock_define_initialized(CLASS,NAME) \
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CLASS __libc_lock_t NAME = PTHREAD_MUTEX_INITIALIZER;
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# endif
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#endif
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#define __libc_rwlock_define_initialized(CLASS,NAME) \
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CLASS __libc_rwlock_t NAME = PTHREAD_RWLOCK_INITIALIZER;
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/* Define an initialized recursive lock variable NAME with storage
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class CLASS. */
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@ -125,63 +64,7 @@ typedef pthread_key_t __libc_key_t;
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{PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP}
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#endif
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#define __rtld_lock_define_initialized_recursive(CLASS,NAME) \
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CLASS __rtld_lock_recursive_t NAME = _RTLD_LOCK_RECURSIVE_INITIALIZER;
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#define _RTLD_LOCK_RECURSIVE_INITIALIZER \
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{PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP}
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#define __rtld_lock_initialize(NAME) \
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(void) ((NAME) = (__rtld_lock_recursive_t) _RTLD_LOCK_RECURSIVE_INITIALIZER)
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/* If we check for a weakly referenced symbol and then perform a
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normal jump to it te code generated for some platforms in case of
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PIC is unnecessarily slow. What would happen is that the function
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is first referenced as data and then it is called indirectly
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through the PLT. We can make this a direct jump. */
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#ifdef __PIC__
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# define __libc_maybe_call(FUNC, ARGS, ELSE) \
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(__extension__ ({ __typeof (FUNC) *_fn = (FUNC); \
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_fn != NULL ? (*_fn) ARGS : ELSE; }))
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#else
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# define __libc_maybe_call(FUNC, ARGS, ELSE) \
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(FUNC != NULL ? FUNC ARGS : ELSE)
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#endif
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/* Call thread functions through the function pointer table. */
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#if defined SHARED && !defined NOT_IN_libc
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# define PTFAVAIL(NAME) __libc_pthread_functions_init
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# define __libc_ptf_call(FUNC, ARGS, ELSE) \
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(__libc_pthread_functions_init ? PTHFCT_CALL (ptr_##FUNC, ARGS) : ELSE)
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# define __libc_ptf_call_always(FUNC, ARGS) \
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PTHFCT_CALL (ptr_##FUNC, ARGS)
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#else
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# define PTFAVAIL(NAME) (NAME != NULL)
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# define __libc_ptf_call(FUNC, ARGS, ELSE) \
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__libc_maybe_call (FUNC, ARGS, ELSE)
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# define __libc_ptf_call_always(FUNC, ARGS) \
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FUNC ARGS
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#endif
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/* Initialize the named lock variable, leaving it in a consistent, unlocked
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state. */
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#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
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# define __libc_lock_init(NAME) ((NAME) = LLL_LOCK_INITIALIZER, 0)
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#else
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# define __libc_lock_init(NAME) \
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__libc_maybe_call (__pthread_mutex_init, (&(NAME), NULL), 0)
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#endif
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#if defined SHARED && !defined NOT_IN_libc
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/* ((NAME) = (__libc_rwlock_t) PTHREAD_RWLOCK_INITIALIZER, 0) is
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inefficient. */
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# define __libc_rwlock_init(NAME) \
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(__builtin_memset (&(NAME), '\0', sizeof (NAME)), 0)
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#else
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# define __libc_rwlock_init(NAME) \
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__libc_maybe_call (__pthread_rwlock_init, (&(NAME), NULL), 0)
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#endif
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/* Same as last but this time we initialize a recursive mutex. */
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/* Initialize a recursive mutex. */
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#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
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# define __libc_lock_init_recursive(NAME) \
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((NAME) = (__libc_lock_recursive_t) _LIBC_LOCK_RECURSIVE_INITIALIZER, 0)
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@ -199,34 +82,6 @@ typedef pthread_key_t __libc_key_t;
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} while (0)
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#endif
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#define __rtld_lock_init_recursive(NAME) \
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do { \
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if (__pthread_mutex_init != NULL) \
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{ \
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pthread_mutexattr_t __attr; \
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__pthread_mutexattr_init (&__attr); \
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__pthread_mutexattr_settype (&__attr, PTHREAD_MUTEX_RECURSIVE_NP); \
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__pthread_mutex_init (&(NAME).mutex, &__attr); \
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__pthread_mutexattr_destroy (&__attr); \
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} \
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} while (0)
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/* Finalize the named lock variable, which must be locked. It cannot be
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used again until __libc_lock_init is called again on it. This must be
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called on a lock variable before the containing storage is reused. */
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#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
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# define __libc_lock_fini(NAME) ((void) 0)
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#else
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# define __libc_lock_fini(NAME) \
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__libc_maybe_call (__pthread_mutex_destroy, (&(NAME)), 0)
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#endif
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#if defined SHARED && !defined NOT_IN_libc
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# define __libc_rwlock_fini(NAME) ((void) 0)
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#else
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# define __libc_rwlock_fini(NAME) \
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__libc_maybe_call (__pthread_rwlock_destroy, (&(NAME)), 0)
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#endif
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/* Finalize recursive named lock. */
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#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
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# define __libc_lock_fini_recursive(NAME) ((void) 0)
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@ -235,19 +90,6 @@ typedef pthread_key_t __libc_key_t;
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__libc_maybe_call (__pthread_mutex_destroy, (&(NAME)), 0)
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#endif
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/* Lock the named lock variable. */
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#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
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# define __libc_lock_lock(NAME) \
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({ lll_lock (NAME, LLL_PRIVATE); 0; })
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#else
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# define __libc_lock_lock(NAME) \
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__libc_maybe_call (__pthread_mutex_lock, (&(NAME)), 0)
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#endif
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#define __libc_rwlock_rdlock(NAME) \
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__libc_ptf_call (__pthread_rwlock_rdlock, (&(NAME)), 0)
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#define __libc_rwlock_wrlock(NAME) \
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__libc_ptf_call (__pthread_rwlock_wrlock, (&(NAME)), 0)
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/* Lock the recursive named lock variable. */
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#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
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# define __libc_lock_lock_recursive(NAME) \
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@ -265,19 +107,6 @@ typedef pthread_key_t __libc_key_t;
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__libc_maybe_call (__pthread_mutex_lock, (&(NAME).mutex), 0)
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#endif
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/* Try to lock the named lock variable. */
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#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
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# define __libc_lock_trylock(NAME) \
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lll_trylock (NAME)
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#else
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# define __libc_lock_trylock(NAME) \
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__libc_maybe_call (__pthread_mutex_trylock, (&(NAME)), 0)
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#endif
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#define __libc_rwlock_tryrdlock(NAME) \
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__libc_maybe_call (__pthread_rwlock_tryrdlock, (&(NAME)), 0)
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#define __libc_rwlock_trywrlock(NAME) \
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__libc_maybe_call (__pthread_rwlock_trywrlock, (&(NAME)), 0)
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/* Try to lock the recursive named lock variable. */
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#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
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# define __libc_lock_trylock_recursive(NAME) \
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@ -303,20 +132,6 @@ typedef pthread_key_t __libc_key_t;
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__libc_maybe_call (__pthread_mutex_trylock, (&(NAME)), 0)
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#endif
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#define __rtld_lock_trylock_recursive(NAME) \
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__libc_maybe_call (__pthread_mutex_trylock, (&(NAME).mutex), 0)
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/* Unlock the named lock variable. */
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#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
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# define __libc_lock_unlock(NAME) \
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lll_unlock (NAME, LLL_PRIVATE)
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#else
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# define __libc_lock_unlock(NAME) \
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__libc_maybe_call (__pthread_mutex_unlock, (&(NAME)), 0)
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#endif
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#define __libc_rwlock_unlock(NAME) \
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__libc_ptf_call (__pthread_rwlock_unlock, (&(NAME)), 0)
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/* Unlock the recursive named lock variable. */
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#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
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/* We do no error checking here. */
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@ -333,58 +148,10 @@ typedef pthread_key_t __libc_key_t;
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__libc_maybe_call (__pthread_mutex_unlock, (&(NAME)), 0)
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#endif
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#if defined _LIBC && defined SHARED
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# define __rtld_lock_default_lock_recursive(lock) \
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++((pthread_mutex_t *)(lock))->__data.__count;
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# define __rtld_lock_default_unlock_recursive(lock) \
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--((pthread_mutex_t *)(lock))->__data.__count;
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# define __rtld_lock_lock_recursive(NAME) \
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GL(dl_rtld_lock_recursive) (&(NAME).mutex)
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# define __rtld_lock_unlock_recursive(NAME) \
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GL(dl_rtld_unlock_recursive) (&(NAME).mutex)
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#else
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# define __rtld_lock_lock_recursive(NAME) \
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__libc_maybe_call (__pthread_mutex_lock, (&(NAME).mutex), 0)
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# define __rtld_lock_unlock_recursive(NAME) \
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__libc_maybe_call (__pthread_mutex_unlock, (&(NAME).mutex), 0)
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#endif
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/* Define once control variable. */
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#if PTHREAD_ONCE_INIT == 0
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/* Special case for static variables where we can avoid the initialization
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if it is zero. */
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# define __libc_once_define(CLASS, NAME) \
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CLASS pthread_once_t NAME
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#else
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# define __libc_once_define(CLASS, NAME) \
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CLASS pthread_once_t NAME = PTHREAD_ONCE_INIT
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#endif
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/* Call handler iff the first call. */
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#define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \
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do { \
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if (PTFAVAIL (__pthread_once)) \
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__libc_ptf_call_always (__pthread_once, (&(ONCE_CONTROL), \
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INIT_FUNCTION)); \
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else if ((ONCE_CONTROL) == PTHREAD_ONCE_INIT) { \
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INIT_FUNCTION (); \
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(ONCE_CONTROL) |= 2; \
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} \
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} while (0)
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/* Note that for I/O cleanup handling we are using the old-style
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cancel handling. It does not have to be integrated with C++ snce
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cancel handling. It does not have to be integrated with C++ since
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no C++ code is called in the middle. The old-style handling is
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faster and the support is not going away. */
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extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
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void (*routine) (void *), void *arg);
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extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
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int execute);
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extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
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void (*routine) (void *), void *arg);
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extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
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@ -415,170 +182,11 @@ extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer
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_buffer.__routine (_buffer.__arg); \
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}
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/* Sometimes we have to exit the block in the middle. */
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#define __libc_cleanup_end(DOIT) \
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if (_avail) { \
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__libc_ptf_call_always (_pthread_cleanup_pop_restore, (&_buffer, DOIT));\
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} else if (DOIT) \
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_buffer.__routine (_buffer.__arg)
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/* Normal cleanup handling, based on C cleanup attribute. */
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__extern_inline void
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__libc_cleanup_routine (struct __pthread_cleanup_frame *f)
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{
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if (f->__do_it)
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f->__cancel_routine (f->__cancel_arg);
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}
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#define __libc_cleanup_push(fct, arg) \
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do { \
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struct __pthread_cleanup_frame __clframe \
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__attribute__ ((__cleanup__ (__libc_cleanup_routine))) \
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= { .__cancel_routine = (fct), .__cancel_arg = (arg), \
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.__do_it = 1 };
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#define __libc_cleanup_pop(execute) \
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__clframe.__do_it = (execute); \
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} while (0)
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/* Create thread-specific key. */
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#define __libc_key_create(KEY, DESTRUCTOR) \
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__libc_ptf_call (__pthread_key_create, (KEY, DESTRUCTOR), 1)
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/* Get thread-specific data. */
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#define __libc_getspecific(KEY) \
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__libc_ptf_call (__pthread_getspecific, (KEY), NULL)
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/* Set thread-specific data. */
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#define __libc_setspecific(KEY, VALUE) \
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__libc_ptf_call (__pthread_setspecific, (KEY, VALUE), 0)
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/* Register handlers to execute before and after `fork'. Note that the
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last parameter is NULL. The handlers registered by the libc are
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never removed so this is OK. */
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#define __libc_atfork(PREPARE, PARENT, CHILD) \
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__register_atfork (PREPARE, PARENT, CHILD, NULL)
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extern int __register_atfork (void (*__prepare) (void),
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void (*__parent) (void),
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void (*__child) (void),
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void *__dso_handle);
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/* Functions that are used by this file and are internal to the GNU C
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library. */
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extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
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const pthread_mutexattr_t *__mutex_attr);
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extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
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extern int __pthread_mutex_trylock (pthread_mutex_t *__mutex);
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extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
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|
||||
extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
|
||||
|
||||
extern int __pthread_mutexattr_init (pthread_mutexattr_t *__attr);
|
||||
|
||||
extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *__attr);
|
||||
|
||||
extern int __pthread_mutexattr_settype (pthread_mutexattr_t *__attr,
|
||||
int __kind);
|
||||
|
||||
#ifdef __USE_UNIX98
|
||||
extern int __pthread_rwlock_init (pthread_rwlock_t *__rwlock,
|
||||
const pthread_rwlockattr_t *__attr);
|
||||
|
||||
extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock);
|
||||
|
||||
extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock);
|
||||
|
||||
extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);
|
||||
|
||||
extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);
|
||||
|
||||
extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock);
|
||||
|
||||
extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock);
|
||||
#endif
|
||||
|
||||
extern int __pthread_key_create (pthread_key_t *__key,
|
||||
void (*__destr_function) (void *));
|
||||
|
||||
extern int __pthread_setspecific (pthread_key_t __key,
|
||||
const void *__pointer);
|
||||
|
||||
extern void *__pthread_getspecific (pthread_key_t __key);
|
||||
|
||||
extern int __pthread_once (pthread_once_t *__once_control,
|
||||
void (*__init_routine) (void));
|
||||
|
||||
extern int __pthread_atfork (void (*__prepare) (void),
|
||||
void (*__parent) (void),
|
||||
void (*__child) (void));
|
||||
|
||||
|
||||
|
||||
/* Make the pthread functions weak so that we can elide them from
|
||||
single-threaded processes. */
|
||||
#ifndef __NO_WEAK_PTHREAD_ALIASES
|
||||
# ifdef weak_extern
|
||||
# if _LIBC
|
||||
# include <bp-sym.h>
|
||||
# else
|
||||
# define BP_SYM(sym) sym
|
||||
# endif
|
||||
weak_extern (BP_SYM (__pthread_mutex_init))
|
||||
weak_extern (BP_SYM (__pthread_mutex_destroy))
|
||||
weak_extern (BP_SYM (__pthread_mutex_lock))
|
||||
weak_extern (BP_SYM (__pthread_mutex_trylock))
|
||||
weak_extern (BP_SYM (__pthread_mutex_unlock))
|
||||
weak_extern (BP_SYM (__pthread_mutexattr_init))
|
||||
weak_extern (BP_SYM (__pthread_mutexattr_destroy))
|
||||
weak_extern (BP_SYM (__pthread_mutexattr_settype))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_init))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_destroy))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_rdlock))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_tryrdlock))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_wrlock))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_trywrlock))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_unlock))
|
||||
weak_extern (BP_SYM (__pthread_key_create))
|
||||
weak_extern (BP_SYM (__pthread_setspecific))
|
||||
weak_extern (BP_SYM (__pthread_getspecific))
|
||||
weak_extern (BP_SYM (__pthread_once))
|
||||
weak_extern (__pthread_initialize)
|
||||
weak_extern (__pthread_atfork)
|
||||
weak_extern (BP_SYM (_pthread_cleanup_push_defer))
|
||||
weak_extern (BP_SYM (_pthread_cleanup_pop_restore))
|
||||
weak_extern (BP_SYM (pthread_setcancelstate))
|
||||
# else
|
||||
# pragma weak __pthread_mutex_init
|
||||
# pragma weak __pthread_mutex_destroy
|
||||
# pragma weak __pthread_mutex_lock
|
||||
# pragma weak __pthread_mutex_trylock
|
||||
# pragma weak __pthread_mutex_unlock
|
||||
# pragma weak __pthread_mutexattr_init
|
||||
# pragma weak __pthread_mutexattr_destroy
|
||||
# pragma weak __pthread_mutexattr_settype
|
||||
# pragma weak __pthread_rwlock_destroy
|
||||
# pragma weak __pthread_rwlock_rdlock
|
||||
# pragma weak __pthread_rwlock_tryrdlock
|
||||
# pragma weak __pthread_rwlock_wrlock
|
||||
# pragma weak __pthread_rwlock_trywrlock
|
||||
# pragma weak __pthread_rwlock_unlock
|
||||
# pragma weak __pthread_key_create
|
||||
# pragma weak __pthread_setspecific
|
||||
# pragma weak __pthread_getspecific
|
||||
# pragma weak __pthread_once
|
||||
# pragma weak __pthread_initialize
|
||||
# pragma weak __pthread_atfork
|
||||
# pragma weak _pthread_cleanup_push_defer
|
||||
# pragma weak _pthread_cleanup_pop_restore
|
||||
# pragma weak pthread_setcancelstate
|
||||
# endif
|
||||
/* Hide the definitions which are only supposed to be used inside libc in
|
||||
a separate file. This file is not present in the installation! */
|
||||
#ifdef _LIBC
|
||||
# include "libc-lockP.h"
|
||||
#endif
|
||||
|
||||
#endif /* bits/libc-lock.h */
|
||||
|
||||
434
nptl/sysdeps/pthread/bits/libc-lockP.h
Normal file
434
nptl/sysdeps/pthread/bits/libc-lockP.h
Normal file
@ -0,0 +1,434 @@
|
||||
/* Private libc-internal interface for mutex locks. NPTL version.
|
||||
Copyright (C) 1996-2003, 2005, 2007, 2012 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public License as
|
||||
published by the Free Software Foundation; either version 2.1 of the
|
||||
License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; see the file COPYING.LIB. If
|
||||
not, see <http://www.gnu.org/licenses/>. */
|
||||
|
||||
#ifndef _BITS_LIBC_LOCKP_H
|
||||
#define _BITS_LIBC_LOCKP_H 1
|
||||
|
||||
#include <pthread.h>
|
||||
#define __need_NULL
|
||||
#include <stddef.h>
|
||||
|
||||
|
||||
/* Fortunately Linux now has a mean to do locking which is realtime
|
||||
safe without the aid of the thread library. We also need no fancy
|
||||
options like error checking mutexes etc. We only need simple
|
||||
locks, maybe recursive. This can be easily and cheaply implemented
|
||||
using futexes. We will use them everywhere except in ld.so since
|
||||
ld.so might be used on old kernels with a different libc.so. */
|
||||
#include <lowlevellock.h>
|
||||
#include <tls.h>
|
||||
#include <pthread-functions.h>
|
||||
|
||||
/* Mutex type. */
|
||||
#if defined NOT_IN_libc && !defined IS_IN_libpthread
|
||||
typedef pthread_mutex_t __libc_lock_t;
|
||||
#else
|
||||
typedef int __libc_lock_t;
|
||||
#endif
|
||||
typedef struct { pthread_mutex_t mutex; } __rtld_lock_recursive_t;
|
||||
typedef pthread_rwlock_t __libc_rwlock_t;
|
||||
|
||||
/* Type for key to thread-specific data. */
|
||||
typedef pthread_key_t __libc_key_t;
|
||||
|
||||
/* Define a lock variable NAME with storage class CLASS. The lock must be
|
||||
initialized with __libc_lock_init before it can be used (or define it
|
||||
with __libc_lock_define_initialized, below). Use `extern' for CLASS to
|
||||
declare a lock defined in another module. In public structure
|
||||
definitions you must use a pointer to the lock structure (i.e., NAME
|
||||
begins with a `*'), because its storage size will not be known outside
|
||||
of libc. */
|
||||
#define __libc_lock_define(CLASS,NAME) \
|
||||
CLASS __libc_lock_t NAME;
|
||||
#define __libc_rwlock_define(CLASS,NAME) \
|
||||
CLASS __libc_rwlock_t NAME;
|
||||
#define __rtld_lock_define_recursive(CLASS,NAME) \
|
||||
CLASS __rtld_lock_recursive_t NAME;
|
||||
|
||||
/* Define an initialized lock variable NAME with storage class CLASS.
|
||||
|
||||
For the C library we take a deeper look at the initializer. For
|
||||
this implementation all fields are initialized to zero. Therefore
|
||||
we don't initialize the variable which allows putting it into the
|
||||
BSS section. (Except on PA-RISC and other odd architectures, where
|
||||
initialized locks must be set to one due to the lack of normal
|
||||
atomic operations.) */
|
||||
|
||||
#if !defined NOT_IN_libc || defined IS_IN_libpthread
|
||||
# if LLL_LOCK_INITIALIZER == 0
|
||||
# define __libc_lock_define_initialized(CLASS,NAME) \
|
||||
CLASS __libc_lock_t NAME;
|
||||
# else
|
||||
# define __libc_lock_define_initialized(CLASS,NAME) \
|
||||
CLASS __libc_lock_t NAME = LLL_LOCK_INITIALIZER;
|
||||
# endif
|
||||
#else
|
||||
# if __LT_SPINLOCK_INIT == 0
|
||||
# define __libc_lock_define_initialized(CLASS,NAME) \
|
||||
CLASS __libc_lock_t NAME;
|
||||
# else
|
||||
# define __libc_lock_define_initialized(CLASS,NAME) \
|
||||
CLASS __libc_lock_t NAME = PTHREAD_MUTEX_INITIALIZER;
|
||||
# endif
|
||||
#endif
|
||||
|
||||
#define __libc_rwlock_define_initialized(CLASS,NAME) \
|
||||
CLASS __libc_rwlock_t NAME = PTHREAD_RWLOCK_INITIALIZER;
|
||||
|
||||
#define __rtld_lock_define_initialized_recursive(CLASS,NAME) \
|
||||
CLASS __rtld_lock_recursive_t NAME = _RTLD_LOCK_RECURSIVE_INITIALIZER;
|
||||
#define _RTLD_LOCK_RECURSIVE_INITIALIZER \
|
||||
{PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP}
|
||||
|
||||
#define __rtld_lock_initialize(NAME) \
|
||||
(void) ((NAME) = (__rtld_lock_recursive_t) _RTLD_LOCK_RECURSIVE_INITIALIZER)
|
||||
|
||||
/* If we check for a weakly referenced symbol and then perform a
|
||||
normal jump to it te code generated for some platforms in case of
|
||||
PIC is unnecessarily slow. What would happen is that the function
|
||||
is first referenced as data and then it is called indirectly
|
||||
through the PLT. We can make this a direct jump. */
|
||||
#ifdef __PIC__
|
||||
# define __libc_maybe_call(FUNC, ARGS, ELSE) \
|
||||
(__extension__ ({ __typeof (FUNC) *_fn = (FUNC); \
|
||||
_fn != NULL ? (*_fn) ARGS : ELSE; }))
|
||||
#else
|
||||
# define __libc_maybe_call(FUNC, ARGS, ELSE) \
|
||||
(FUNC != NULL ? FUNC ARGS : ELSE)
|
||||
#endif
|
||||
|
||||
/* Call thread functions through the function pointer table. */
|
||||
#if defined SHARED && !defined NOT_IN_libc
|
||||
# define PTFAVAIL(NAME) __libc_pthread_functions_init
|
||||
# define __libc_ptf_call(FUNC, ARGS, ELSE) \
|
||||
(__libc_pthread_functions_init ? PTHFCT_CALL (ptr_##FUNC, ARGS) : ELSE)
|
||||
# define __libc_ptf_call_always(FUNC, ARGS) \
|
||||
PTHFCT_CALL (ptr_##FUNC, ARGS)
|
||||
#else
|
||||
# define PTFAVAIL(NAME) (NAME != NULL)
|
||||
# define __libc_ptf_call(FUNC, ARGS, ELSE) \
|
||||
__libc_maybe_call (FUNC, ARGS, ELSE)
|
||||
# define __libc_ptf_call_always(FUNC, ARGS) \
|
||||
FUNC ARGS
|
||||
#endif
|
||||
|
||||
|
||||
/* Initialize the named lock variable, leaving it in a consistent, unlocked
|
||||
state. */
|
||||
#if !defined NOT_IN_libc || defined IS_IN_libpthread
|
||||
# define __libc_lock_init(NAME) ((NAME) = LLL_LOCK_INITIALIZER, 0)
|
||||
#else
|
||||
# define __libc_lock_init(NAME) \
|
||||
__libc_maybe_call (__pthread_mutex_init, (&(NAME), NULL), 0)
|
||||
#endif
|
||||
#if defined SHARED && !defined NOT_IN_libc
|
||||
/* ((NAME) = (__libc_rwlock_t) PTHREAD_RWLOCK_INITIALIZER, 0) is
|
||||
inefficient. */
|
||||
# define __libc_rwlock_init(NAME) \
|
||||
(__builtin_memset (&(NAME), '\0', sizeof (NAME)), 0)
|
||||
#else
|
||||
# define __libc_rwlock_init(NAME) \
|
||||
__libc_maybe_call (__pthread_rwlock_init, (&(NAME), NULL), 0)
|
||||
#endif
|
||||
|
||||
#define __rtld_lock_init_recursive(NAME) \
|
||||
do { \
|
||||
if (__pthread_mutex_init != NULL) \
|
||||
{ \
|
||||
pthread_mutexattr_t __attr; \
|
||||
__pthread_mutexattr_init (&__attr); \
|
||||
__pthread_mutexattr_settype (&__attr, PTHREAD_MUTEX_RECURSIVE_NP); \
|
||||
__pthread_mutex_init (&(NAME).mutex, &__attr); \
|
||||
__pthread_mutexattr_destroy (&__attr); \
|
||||
} \
|
||||
} while (0)
|
||||
|
||||
/* Finalize the named lock variable, which must be locked. It cannot be
|
||||
used again until __libc_lock_init is called again on it. This must be
|
||||
called on a lock variable before the containing storage is reused. */
|
||||
#if !defined NOT_IN_libc || defined IS_IN_libpthread
|
||||
# define __libc_lock_fini(NAME) ((void) 0)
|
||||
#else
|
||||
# define __libc_lock_fini(NAME) \
|
||||
__libc_maybe_call (__pthread_mutex_destroy, (&(NAME)), 0)
|
||||
#endif
|
||||
#if defined SHARED && !defined NOT_IN_libc
|
||||
# define __libc_rwlock_fini(NAME) ((void) 0)
|
||||
#else
|
||||
# define __libc_rwlock_fini(NAME) \
|
||||
__libc_maybe_call (__pthread_rwlock_destroy, (&(NAME)), 0)
|
||||
#endif
|
||||
|
||||
/* Lock the named lock variable. */
|
||||
#if !defined NOT_IN_libc || defined IS_IN_libpthread
|
||||
# define __libc_lock_lock(NAME) \
|
||||
({ lll_lock (NAME, LLL_PRIVATE); 0; })
|
||||
#else
|
||||
# define __libc_lock_lock(NAME) \
|
||||
__libc_maybe_call (__pthread_mutex_lock, (&(NAME)), 0)
|
||||
#endif
|
||||
#define __libc_rwlock_rdlock(NAME) \
|
||||
__libc_ptf_call (__pthread_rwlock_rdlock, (&(NAME)), 0)
|
||||
#define __libc_rwlock_wrlock(NAME) \
|
||||
__libc_ptf_call (__pthread_rwlock_wrlock, (&(NAME)), 0)
|
||||
|
||||
/* Try to lock the named lock variable. */
|
||||
#if !defined NOT_IN_libc || defined IS_IN_libpthread
|
||||
# define __libc_lock_trylock(NAME) \
|
||||
lll_trylock (NAME)
|
||||
#else
|
||||
# define __libc_lock_trylock(NAME) \
|
||||
__libc_maybe_call (__pthread_mutex_trylock, (&(NAME)), 0)
|
||||
#endif
|
||||
#define __libc_rwlock_tryrdlock(NAME) \
|
||||
__libc_maybe_call (__pthread_rwlock_tryrdlock, (&(NAME)), 0)
|
||||
#define __libc_rwlock_trywrlock(NAME) \
|
||||
__libc_maybe_call (__pthread_rwlock_trywrlock, (&(NAME)), 0)
|
||||
|
||||
#define __rtld_lock_trylock_recursive(NAME) \
|
||||
__libc_maybe_call (__pthread_mutex_trylock, (&(NAME).mutex), 0)
|
||||
|
||||
/* Unlock the named lock variable. */
|
||||
#if !defined NOT_IN_libc || defined IS_IN_libpthread
|
||||
# define __libc_lock_unlock(NAME) \
|
||||
lll_unlock (NAME, LLL_PRIVATE)
|
||||
#else
|
||||
# define __libc_lock_unlock(NAME) \
|
||||
__libc_maybe_call (__pthread_mutex_unlock, (&(NAME)), 0)
|
||||
#endif
|
||||
#define __libc_rwlock_unlock(NAME) \
|
||||
__libc_ptf_call (__pthread_rwlock_unlock, (&(NAME)), 0)
|
||||
|
||||
#ifdef SHARED
|
||||
# define __rtld_lock_default_lock_recursive(lock) \
|
||||
++((pthread_mutex_t *)(lock))->__data.__count;
|
||||
|
||||
# define __rtld_lock_default_unlock_recursive(lock) \
|
||||
--((pthread_mutex_t *)(lock))->__data.__count;
|
||||
|
||||
# define __rtld_lock_lock_recursive(NAME) \
|
||||
GL(dl_rtld_lock_recursive) (&(NAME).mutex)
|
||||
|
||||
# define __rtld_lock_unlock_recursive(NAME) \
|
||||
GL(dl_rtld_unlock_recursive) (&(NAME).mutex)
|
||||
#else
|
||||
# define __rtld_lock_lock_recursive(NAME) \
|
||||
__libc_maybe_call (__pthread_mutex_lock, (&(NAME).mutex), 0)
|
||||
|
||||
# define __rtld_lock_unlock_recursive(NAME) \
|
||||
__libc_maybe_call (__pthread_mutex_unlock, (&(NAME).mutex), 0)
|
||||
#endif
|
||||
|
||||
/* Define once control variable. */
|
||||
#if PTHREAD_ONCE_INIT == 0
|
||||
/* Special case for static variables where we can avoid the initialization
|
||||
if it is zero. */
|
||||
# define __libc_once_define(CLASS, NAME) \
|
||||
CLASS pthread_once_t NAME
|
||||
#else
|
||||
# define __libc_once_define(CLASS, NAME) \
|
||||
CLASS pthread_once_t NAME = PTHREAD_ONCE_INIT
|
||||
#endif
|
||||
|
||||
/* Call handler iff the first call. */
|
||||
#define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \
|
||||
do { \
|
||||
if (PTFAVAIL (__pthread_once)) \
|
||||
__libc_ptf_call_always (__pthread_once, (&(ONCE_CONTROL), \
|
||||
INIT_FUNCTION)); \
|
||||
else if ((ONCE_CONTROL) == PTHREAD_ONCE_INIT) { \
|
||||
INIT_FUNCTION (); \
|
||||
(ONCE_CONTROL) |= 2; \
|
||||
} \
|
||||
} while (0)
|
||||
|
||||
|
||||
/* Note that for I/O cleanup handling we are using the old-style
|
||||
cancel handling. It does not have to be integrated with C++ snce
|
||||
no C++ code is called in the middle. The old-style handling is
|
||||
faster and the support is not going away. */
|
||||
extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
|
||||
void (*routine) (void *), void *arg);
|
||||
extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
|
||||
int execute);
|
||||
extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
|
||||
void (*routine) (void *), void *arg);
|
||||
extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
|
||||
int execute);
|
||||
|
||||
/* Sometimes we have to exit the block in the middle. */
|
||||
#define __libc_cleanup_end(DOIT) \
|
||||
if (_avail) { \
|
||||
__libc_ptf_call_always (_pthread_cleanup_pop_restore, (&_buffer, DOIT));\
|
||||
} else if (DOIT) \
|
||||
_buffer.__routine (_buffer.__arg)
|
||||
|
||||
|
||||
/* Normal cleanup handling, based on C cleanup attribute. */
|
||||
__extern_inline void
|
||||
__libc_cleanup_routine (struct __pthread_cleanup_frame *f)
|
||||
{
|
||||
if (f->__do_it)
|
||||
f->__cancel_routine (f->__cancel_arg);
|
||||
}
|
||||
|
||||
#define __libc_cleanup_push(fct, arg) \
|
||||
do { \
|
||||
struct __pthread_cleanup_frame __clframe \
|
||||
__attribute__ ((__cleanup__ (__libc_cleanup_routine))) \
|
||||
= { .__cancel_routine = (fct), .__cancel_arg = (arg), \
|
||||
.__do_it = 1 };
|
||||
|
||||
#define __libc_cleanup_pop(execute) \
|
||||
__clframe.__do_it = (execute); \
|
||||
} while (0)
|
||||
|
||||
|
||||
/* Create thread-specific key. */
|
||||
#define __libc_key_create(KEY, DESTRUCTOR) \
|
||||
__libc_ptf_call (__pthread_key_create, (KEY, DESTRUCTOR), 1)
|
||||
|
||||
/* Get thread-specific data. */
|
||||
#define __libc_getspecific(KEY) \
|
||||
__libc_ptf_call (__pthread_getspecific, (KEY), NULL)
|
||||
|
||||
/* Set thread-specific data. */
|
||||
#define __libc_setspecific(KEY, VALUE) \
|
||||
__libc_ptf_call (__pthread_setspecific, (KEY, VALUE), 0)
|
||||
|
||||
|
||||
/* Register handlers to execute before and after `fork'. Note that the
|
||||
last parameter is NULL. The handlers registered by the libc are
|
||||
never removed so this is OK. */
|
||||
#define __libc_atfork(PREPARE, PARENT, CHILD) \
|
||||
__register_atfork (PREPARE, PARENT, CHILD, NULL)
|
||||
extern int __register_atfork (void (*__prepare) (void),
|
||||
void (*__parent) (void),
|
||||
void (*__child) (void),
|
||||
void *__dso_handle);
|
||||
|
||||
/* Functions that are used by this file and are internal to the GNU C
|
||||
library. */
|
||||
|
||||
extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
|
||||
const pthread_mutexattr_t *__mutex_attr);
|
||||
|
||||
extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
|
||||
|
||||
extern int __pthread_mutex_trylock (pthread_mutex_t *__mutex);
|
||||
|
||||
extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
|
||||
|
||||
extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
|
||||
|
||||
extern int __pthread_mutexattr_init (pthread_mutexattr_t *__attr);
|
||||
|
||||
extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *__attr);
|
||||
|
||||
extern int __pthread_mutexattr_settype (pthread_mutexattr_t *__attr,
|
||||
int __kind);
|
||||
|
||||
extern int __pthread_rwlock_init (pthread_rwlock_t *__rwlock,
|
||||
const pthread_rwlockattr_t *__attr);
|
||||
|
||||
extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock);
|
||||
|
||||
extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock);
|
||||
|
||||
extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);
|
||||
|
||||
extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);
|
||||
|
||||
extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock);
|
||||
|
||||
extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock);
|
||||
|
||||
extern int __pthread_key_create (pthread_key_t *__key,
|
||||
void (*__destr_function) (void *));
|
||||
|
||||
extern int __pthread_setspecific (pthread_key_t __key,
|
||||
const void *__pointer);
|
||||
|
||||
extern void *__pthread_getspecific (pthread_key_t __key);
|
||||
|
||||
extern int __pthread_once (pthread_once_t *__once_control,
|
||||
void (*__init_routine) (void));
|
||||
|
||||
extern int __pthread_atfork (void (*__prepare) (void),
|
||||
void (*__parent) (void),
|
||||
void (*__child) (void));
|
||||
|
||||
|
||||
|
||||
/* Make the pthread functions weak so that we can elide them from
|
||||
single-threaded processes. */
|
||||
#ifndef __NO_WEAK_PTHREAD_ALIASES
|
||||
# ifdef weak_extern
|
||||
# include <bp-sym.h>
|
||||
weak_extern (BP_SYM (__pthread_mutex_init))
|
||||
weak_extern (BP_SYM (__pthread_mutex_destroy))
|
||||
weak_extern (BP_SYM (__pthread_mutex_lock))
|
||||
weak_extern (BP_SYM (__pthread_mutex_trylock))
|
||||
weak_extern (BP_SYM (__pthread_mutex_unlock))
|
||||
weak_extern (BP_SYM (__pthread_mutexattr_init))
|
||||
weak_extern (BP_SYM (__pthread_mutexattr_destroy))
|
||||
weak_extern (BP_SYM (__pthread_mutexattr_settype))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_init))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_destroy))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_rdlock))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_tryrdlock))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_wrlock))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_trywrlock))
|
||||
weak_extern (BP_SYM (__pthread_rwlock_unlock))
|
||||
weak_extern (BP_SYM (__pthread_key_create))
|
||||
weak_extern (BP_SYM (__pthread_setspecific))
|
||||
weak_extern (BP_SYM (__pthread_getspecific))
|
||||
weak_extern (BP_SYM (__pthread_once))
|
||||
weak_extern (__pthread_initialize)
|
||||
weak_extern (__pthread_atfork)
|
||||
weak_extern (BP_SYM (_pthread_cleanup_push_defer))
|
||||
weak_extern (BP_SYM (_pthread_cleanup_pop_restore))
|
||||
weak_extern (BP_SYM (pthread_setcancelstate))
|
||||
# else
|
||||
# pragma weak __pthread_mutex_init
|
||||
# pragma weak __pthread_mutex_destroy
|
||||
# pragma weak __pthread_mutex_lock
|
||||
# pragma weak __pthread_mutex_trylock
|
||||
# pragma weak __pthread_mutex_unlock
|
||||
# pragma weak __pthread_mutexattr_init
|
||||
# pragma weak __pthread_mutexattr_destroy
|
||||
# pragma weak __pthread_mutexattr_settype
|
||||
# pragma weak __pthread_rwlock_destroy
|
||||
# pragma weak __pthread_rwlock_rdlock
|
||||
# pragma weak __pthread_rwlock_tryrdlock
|
||||
# pragma weak __pthread_rwlock_wrlock
|
||||
# pragma weak __pthread_rwlock_trywrlock
|
||||
# pragma weak __pthread_rwlock_unlock
|
||||
# pragma weak __pthread_key_create
|
||||
# pragma weak __pthread_setspecific
|
||||
# pragma weak __pthread_getspecific
|
||||
# pragma weak __pthread_once
|
||||
# pragma weak __pthread_initialize
|
||||
# pragma weak __pthread_atfork
|
||||
# pragma weak _pthread_cleanup_push_defer
|
||||
# pragma weak _pthread_cleanup_pop_restore
|
||||
# pragma weak pthread_setcancelstate
|
||||
# endif
|
||||
#endif
|
||||
|
||||
#endif /* bits/libc-lockP.h */
|
||||
Loading…
Reference in New Issue
Block a user