mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-03 04:01:43 +08:00
76a50749f7
2002-11-26 Ulrich Drepper <drepper@redhat.com> * allocatestack.c (queue_stack): Don't remove stack from list here. Do it in the caller. Correct condition to prematurely terminate loop to free stacks. (__deallocate_stack): Remove stack from list here. 2002-11-26 Ulrich Drepper <drepper@redhat.com> * Makefile (tests): Add tst-stack1. * tst-stack1.c: New file. * allocatestack.c (allocate_stack): Initialize the TCB on a user provided stack. * pthread_attr_getstack.c: Return bottom of the thread area. 2002-11-25 Ulrich Drepper <drepper@redhat.com> * Makefile (libpthread-routines): Add pt-allocrtsig and pthread_kill_other_threads. * pt-allocrtsig.c: New file. * pthread_kill_other_threads.c: New file. * sysdeps/unix/sysv/linux/allocrtsig.c: Add additional aliases for all three functions. * sysdeps/unix/sysv/linux/Makefile (sysdep_routines): Remove allocrtsig. * sysdeps/unix/sysv/linux/Versions (libc:GLIBC_PRIVATE): Export __libc_current_sigrtmin_private, __libc_current_sigrtmax_private, and __libc_allocate_rtsig_private. * Versions (libpthread): Export pthread_kill_other_threads_np, __libc_current_sigrtmin, and __libc_current_sigrtmax. 2002-11-24 Ulrich Drepper <drepper@redhat.com> * allocatestack.c (allocate_stack): stackaddr in attribute points to the end of the stack. Adjust computations. When mprotect call fails dequeue stack and free it. * pthread_attr_setstack.c: Store top of the stack in stackaddr attribute. * pthread_getattr_np.c: Likewise. * descr.h (IS_DETACHED): Add some more parenthesis to prevent surprises. 2002-11-23 Ulrich Drepper <drepper@redhat.com> * sysdeps/pthread/pthread.h (pthread_self): __THROW must come before attribute definitions. Patch by Luca Barbieri <ldb@ldb.ods.org>. 2002-11-22 Ulrich Drepper <drepper@redhat.com> * pthread_getspecific.c: Optimize access to first 2nd-level array. * pthread_setspecific.c: Likewise. 2002-11-21 Ulrich Drepper <drepper@redhat.com> * sysdeps/unix/sysv/linux/i386/createthread.c: Remove CLONE_ flags definitions. Get them from the official place. * sysdeps/unix/sysv/linux/i386/fork.c: Likewise. * sysdeps/unix/sysv/linux/i386/createthread.c: Update CLONE_* flags. Use new CLONE_ flags in clone() calls. * sysdeps/unix/sysv/linux/fork.c: Use ARCH_FORK to actually fork. * sysdeps/unix/sysv/linux/i386/fork.c: New file. * Versions: Add pthread_* functions for libc. * forward.c: New file. * sysdeps/pthread/Makefile (libpthread-sysdeps_routines): Add errno-loc. * herrno.c: New file. * res.c: New file. * Makefile (libpthread-routines): Remove sem_post, sem_wait, sem_trywait, and sem_timedwait. Add herrno and res. * sem_init.c: Don't initialize lock and waiters members. * sem_open.c: Likewise. * sem_post.c: Removed. * sem_wait.c: Removed. * sem_trywait.c: Removed. * sem_timedwait.c: Removed. * sysdeps/unix/sysv/linux/i386/i486/lowlevelsem.S: Complete rewrite. Includes full implementations of sem_post, sem_wait, sem_trywait, and sem_timedwait. * sysdeps/unix/sysv/linux/i386/lowlevelsem.h (lll_sem_post): Adjust for new implementation. * sysdeps/unix/sysv/linux/internaltypes.h (struct sem): Remove lock and waiters fields. * tst-sem3.c: Improve error message. * tst-signal3.c: Likewise. * init.c (__pthread_initialize_minimal): Use set_tid_address syscall to tell the kernel about the termination futex and to initialize tid member. Don't initialize main_thread. * descr.h (struct pthread): Remove main_thread member. * cancelllation.c (__do_cancel): Remove code handling main thread. The main thread is not special anymore. * allocatestack.c (__reclaim_stacks): Mark stacks as unused. Add size of the stacks to stack_cache_actsize. * pt-readv.c: Add missing "defined". * pt-sigwait.c: Likewise. * pt-writev.c: Likewise. 2002-11-09 Ulrich Drepper <drepper@redhat.com> * Versions: Export __connect from libpthread. Patch by Luca Barbieri <ldb@ldb.ods.org>. * Makefile (libpthread-routines): Add pt-raise. * sysdeps/unix/sysv/linux/raise.c: New file. * sysdeps/unix/sysv/linux/pt-raise.c: New file. * sysdeps/generic/pt-raise.c: New file. * pthread_cond_init.c: Initialize all data elements of the condvar structure. Patch by Luca Barbieri <ldb@ldb.ods.org>. * pthread_attr_init.c: Actually implement 2.0 compatibility version. * pthread_create.c: Likewise. * Makefile (tests): Add tst-key1, tst-key2, tst-key3. * tst-key1.c: New file. * tst-key2.c: New file. * tst-key3.c: New file. * Versions: Export pthread_detach for version GLIBC_2.0. Reported by Saurabh Desai <sdesai@austin.ibm.com>. 2002-11-08 Ulrich Drepper <drepper@redhat.com> * pthread_key_create.c: Terminate search after an unused key was found. Patch by Luca Barbieri <ldb@ldb.ods.org>. * sysdeps/unix/sysv/linux/i386/pthread_once.S: Return zero. Patch by Luca Barbieri <ldb@ldb.ods.org>. 2002-10-10 Ulrich Drepper <drepper@redhat.com> * sysdeps/unix/sysv/linux/i386/i486/lowlevelsem.S: Use slow generic dynamic lookup for errno in PIC. * allocatestack.c (get_cached_stack): Rearrange code slightly to release the stack lock as soon as possible. Call _dl_allocate_tls_init for TCB from the cache to re-initialize the static TLS block. (allocate_stack): Call _dl_allocate_tls_init for user-provided stack. * cancellation.c: Renamed from cancelation.c. * Makefile: Adjust accordingly. * pthreadP.h (CANCELLATION_P): Renamed from CANCELATION_P. * cleanup_defer.c: Use CANCELLATION_P. * pthread_testcancel.c: Likewise. * descr.h: Fix spelling in comments. * init.c: Likewise. * pthread_getattr_np.c: Likewise. * pthread_getschedparam.c: Likewise. * pthread_setschedparam.c: Likewise. * Versions: Likewise. * pt-pselect.c: New file. * Makefile (libpthread-routines): Add pt-pselect. * Versions: Add pselect. * tst-cancel4.c: New file. * Makefile (tests): Add tst-cancel4. 2002-10-09 Ulrich Drepper <drepper@redhat.com> * pthread_mutex_lock.c: Always record lock ownership. * pthread_mutex_timedlock.c: Likewise. * pthread_mutex_trylock.c: Likewise. * pt-readv.c: New file. * pt-writev.c: New file. * pt-creat.c: New file. * pt-msgrcv.c: New file. * pt-msgsnd.c: New file. * pt-poll.c: New file. * pt-select.c: New file. * pt-sigpause.c: New file. * pt-sigsuspend.c: New file. * pt-sigwait.c: New file. * pt-sigwaitinfo.c: New file. * pt-waitid.c: New file. * Makefile (libpthread-routines): Add pt-readv, pt-writev, pt-creat, pt-msgrcv, pt-msgsnd, pt-poll, pt-select, pt-sigpause, pt-sigsuspend, pt-sigwait, pt-sigwaitinfo, and pt-waitid. * Versions: Add all the new functions. * tst-exit1.c: New file. * Makefile (tests): Add tst-exit1. * sem_timedwait.c: Minor optimization for more optimal fastpath. 2002-10-08 Ulrich Drepper <drepper@redhat.com> * pt-fcntl.c: Only enable asynchronous cancellation for F_SETLKW. * pthread_join.c: Enable asynchronous cancellation around lll_wait_tid call. pthread_join is an official cancellation point. * pthread_timedjoin.c: Likewise. * pthread_cond_wait.c: Revert order in which internal lock are dropped and the condvar's mutex are retrieved. * pthread_cond_timedwait.c: Likewise. Reported by dice@saros.East.Sun.COM. 2002-10-07 Ulrich Drepper <drepper@redhat.com> * pthreadP.h: Cut out all type definitions and move them... * sysdeps/unix/sysv/linux/internaltypes.h: ...here. New file. * pthreadP.h: Include <internaltypes.h>. * sysdeps/unix/sysv/linux/i386/lowlevelsem.h (lll_sem_post): Little performance tweaks. * sem_trywait.c: Shuffle #includes around to get right order. * sem_timedwait.c: Likewise. * sem_post.c: Likewise. * sem_wait.c: Likewise. * nptl 0.3 released. * Makefile (tests): Add tst-signal3. * tst-signal3.c: New file. 2002-10-05 Ulrich Drepper <drepper@redhat.com> * sysdeps/unix/sysv/linux/i386/lowlevelsem.h: Tell the compiler that the asms modify the sem object. (__lll_sem_timedwait): Now takes struct sem* as first parameter. * sysdeps/unix/sysv/linux/i386/bits/semaphore.h (sem_t): Don't expose the actual members. * pthreadP.h (struct sem): New type. Actual semaphore type. * semaphoreP.h: Include pthreadP.h. * sem_getvalue.c: Adjust to sem_t change. * sem_init.c: Likewise. * sem_open.c: Likewise. * sem_post.c: Likewise. * sem_timedwait.c: Likewise. * sem_trywait.c: Likewise. * sem_wait.c: Likewise. 2002-10-04 Ulrich Drepper <drepper@redhat.com> * Makefile (tests): Add tst-basic2, tst-exec1, tst-exec3, tst-exec3. * tst-basic2.c: New file. * tst-exec1.c: New file. * tst-exec2.c: New file. * tst-exec3.c: New file. * tst-fork1.c: Remove extra */. * nptl 0.2 released. The API for IA-32 is complete.
593 lines
16 KiB
C
593 lines
16 KiB
C
/* Helper code for POSIX timer implementation on LinuxThreads.
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Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <assert.h>
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#include <errno.h>
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#include <pthread.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysdep.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include "posix-timer.h"
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#include <pthreadP.h>
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/* Number of threads used. */
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#define THREAD_MAXNODES 16
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/* Array containing the descriptors for the used threads. */
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static struct thread_node thread_array[THREAD_MAXNODES];
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/* Static array with the structures for all the timers. */
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struct timer_node __timer_array[TIMER_MAX];
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/* Global lock to protect operation on the lists. */
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pthread_mutex_t __timer_mutex = PTHREAD_MUTEX_INITIALIZER;
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/* Variable to protext initialization. */
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pthread_once_t __timer_init_once_control = PTHREAD_ONCE_INIT;
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/* Nonzero if initialization of timer implementation failed. */
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int __timer_init_failed;
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/* Node for the thread used to deliver signals. */
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struct thread_node __timer_signal_thread_rclk;
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#ifdef _POSIX_CPUTIME
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struct thread_node __timer_signal_thread_pclk;
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#endif
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#ifdef _POSIX_THREAD_CPUTIME
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struct thread_node __timer_signal_thread_tclk;
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#endif
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/* Lists to keep free and used timers and threads. */
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struct list_links timer_free_list;
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struct list_links thread_free_list;
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struct list_links thread_active_list;
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#ifdef __NR_rt_sigqueueinfo
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extern int __syscall_rt_sigqueueinfo (int, int, siginfo_t *);
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#endif
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/* List handling functions. */
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static inline void
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list_init (struct list_links *list)
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{
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list->next = list->prev = list;
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}
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static inline void
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list_append (struct list_links *list, struct list_links *newp)
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{
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newp->prev = list->prev;
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newp->next = list;
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list->prev->next = newp;
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list->prev = newp;
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}
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static inline void
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list_insbefore (struct list_links *list, struct list_links *newp)
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{
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list_append (list, newp);
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}
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/*
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* Like list_unlink_ip, except that calling it on a node that
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* is already unlinked is disastrous rather than a noop.
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*/
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static inline void
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list_unlink (struct list_links *list)
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{
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struct list_links *lnext = list->next, *lprev = list->prev;
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lnext->prev = lprev;
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lprev->next = lnext;
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}
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static inline struct list_links *
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list_first (struct list_links *list)
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{
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return list->next;
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}
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static inline struct list_links *
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list_null (struct list_links *list)
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{
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return list;
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}
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static inline struct list_links *
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list_next (struct list_links *list)
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{
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return list->next;
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}
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static inline int
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list_isempty (struct list_links *list)
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{
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return list->next == list;
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}
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/* Functions build on top of the list functions. */
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static inline struct thread_node *
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thread_links2ptr (struct list_links *list)
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{
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return (struct thread_node *) ((char *) list
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- offsetof (struct thread_node, links));
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}
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static inline struct timer_node *
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timer_links2ptr (struct list_links *list)
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{
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return (struct timer_node *) ((char *) list
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- offsetof (struct timer_node, links));
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}
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/* Initialize a newly allocated thread structure. */
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static void
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thread_init (struct thread_node *thread, const pthread_attr_t *attr, clockid_t clock_id)
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{
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if (attr != NULL)
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thread->attr = *attr;
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else
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{
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pthread_attr_init (&thread->attr);
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pthread_attr_setdetachstate (&thread->attr, PTHREAD_CREATE_DETACHED);
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}
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thread->exists = 0;
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list_init (&thread->timer_queue);
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pthread_cond_init (&thread->cond, 0);
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thread->current_timer = 0;
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thread->captured = pthread_self ();
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thread->clock_id = clock_id;
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}
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/* Initialize the global lists, and acquire global resources. Error
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reporting is done by storing a non-zero value to the global variable
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timer_init_failed. */
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static void
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init_module (void)
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{
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int i;
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list_init (&timer_free_list);
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list_init (&thread_free_list);
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list_init (&thread_active_list);
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for (i = 0; i < TIMER_MAX; ++i)
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{
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list_append (&timer_free_list, &__timer_array[i].links);
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__timer_array[i].inuse = TIMER_FREE;
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}
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for (i = 0; i < THREAD_MAXNODES; ++i)
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list_append (&thread_free_list, &thread_array[i].links);
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thread_init (&__timer_signal_thread_rclk, 0, CLOCK_REALTIME);
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#ifdef _POSIX_CPUTIME
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thread_init (&__timer_signal_thread_pclk, 0, CLOCK_PROCESS_CPUTIME_ID);
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#endif
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#ifdef _POSIX_THREAD_CPUTIME
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thread_init (&__timer_signal_thread_tclk, 0, CLOCK_THREAD_CPUTIME_ID);
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#endif
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}
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/* This is a handler executed in a child process after a fork()
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occurs. It reinitializes the module, resetting all of the data
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structures to their initial state. The mutex is initialized in
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case it was locked in the parent process. */
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static void
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reinit_after_fork (void)
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{
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init_module ();
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pthread_mutex_init (&__timer_mutex, 0);
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}
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/* Called once form pthread_once in timer_init. This initializes the
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module and ensures that reinit_after_fork will be executed in any
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child process. */
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void
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__timer_init_once (void)
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{
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init_module ();
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pthread_atfork (0, 0, reinit_after_fork);
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}
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/* Deinitialize a thread that is about to be deallocated. */
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static void
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thread_deinit (struct thread_node *thread)
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{
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assert (list_isempty (&thread->timer_queue));
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pthread_cond_destroy (&thread->cond);
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}
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/* Allocate a thread structure from the global free list. Global
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mutex lock must be held by caller. The thread is moved to
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the active list. */
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struct thread_node *
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__timer_thread_alloc (const pthread_attr_t *desired_attr, clockid_t clock_id)
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{
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struct list_links *node = list_first (&thread_free_list);
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if (node != list_null (&thread_free_list))
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{
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struct thread_node *thread = thread_links2ptr (node);
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list_unlink (node);
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thread_init (thread, desired_attr, clock_id);
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list_append (&thread_active_list, node);
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return thread;
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}
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return 0;
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}
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/* Return a thread structure to the global free list. Global lock
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must be held by caller. */
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void
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__timer_thread_dealloc (struct thread_node *thread)
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{
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thread_deinit (thread);
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list_unlink (&thread->links);
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list_append (&thread_free_list, &thread->links);
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}
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/* Each of our threads which terminates executes this cleanup
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handler. We never terminate threads ourselves; if a thread gets here
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it means that the evil application has killed it. If the thread has
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timers, these require servicing and so we must hire a replacement
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thread right away. We must also unblock another thread that may
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have been waiting for this thread to finish servicing a timer (see
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timer_delete()). */
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static void
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thread_cleanup (void *val)
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{
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if (val != NULL)
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{
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struct thread_node *thread = val;
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/* How did the signal thread get killed? */
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assert (thread != &__timer_signal_thread_rclk);
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#ifdef _POSIX_CPUTIME
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assert (thread != &__timer_signal_thread_pclk);
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#endif
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#ifdef _POSIX_THREAD_CPUTIME
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assert (thread != &__timer_signal_thread_tclk);
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#endif
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pthread_mutex_lock (&__timer_mutex);
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thread->exists = 0;
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/* We are no longer processing a timer event. */
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thread->current_timer = 0;
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if (list_isempty (&thread->timer_queue))
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__timer_thread_dealloc (thread);
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else
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(void) __timer_thread_start (thread);
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pthread_mutex_unlock (&__timer_mutex);
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/* Unblock potentially blocked timer_delete(). */
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pthread_cond_broadcast (&thread->cond);
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}
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}
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/* Handle a timer which is supposed to go off now. */
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static void
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thread_expire_timer (struct thread_node *self, struct timer_node *timer)
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{
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self->current_timer = timer; /* Lets timer_delete know timer is running. */
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pthread_mutex_unlock (&__timer_mutex);
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switch (__builtin_expect (timer->event.sigev_notify, SIGEV_SIGNAL))
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{
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case SIGEV_NONE:
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assert (! "timer_create should never have created such a timer");
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break;
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case SIGEV_SIGNAL:
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#ifdef __NR_rt_sigqueueinfo
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{
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siginfo_t info;
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/* First, clear the siginfo_t structure, so that we don't pass our
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stack content to other tasks. */
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memset (&info, 0, sizeof (siginfo_t));
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/* We must pass the information about the data in a siginfo_t
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value. */
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info.si_signo = timer->event.sigev_signo;
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info.si_code = SI_TIMER;
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info.si_pid = timer->creator_pid;
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info.si_uid = getuid ();
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info.si_value = timer->event.sigev_value;
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INLINE_SYSCALL (rt_sigqueueinfo, 3, info.si_pid, info.si_signo, &info);
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}
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#else
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if (pthread_kill (self->captured, timer->event.sigev_signo) != 0)
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{
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if (pthread_kill (self->id, timer->event.sigev_signo) != 0)
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abort ();
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}
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#endif
|
|
break;
|
|
|
|
case SIGEV_THREAD:
|
|
timer->event.sigev_notify_function (timer->event.sigev_value);
|
|
break;
|
|
|
|
default:
|
|
assert (! "unknown event");
|
|
break;
|
|
}
|
|
|
|
pthread_mutex_lock (&__timer_mutex);
|
|
|
|
self->current_timer = 0;
|
|
|
|
pthread_cond_broadcast (&self->cond);
|
|
}
|
|
|
|
|
|
/* Thread function; executed by each timer thread. The job of this
|
|
function is to wait on the thread's timer queue and expire the
|
|
timers in chronological order as close to their scheduled time as
|
|
possible. */
|
|
static void
|
|
__attribute__ ((noreturn))
|
|
thread_func (void *arg)
|
|
{
|
|
struct thread_node *self = arg;
|
|
|
|
/* Register cleanup handler, in case rogue application terminates
|
|
this thread. (This cannot happen to __timer_signal_thread, which
|
|
doesn't invoke application callbacks). */
|
|
|
|
pthread_cleanup_push (thread_cleanup, self);
|
|
|
|
pthread_mutex_lock (&__timer_mutex);
|
|
|
|
while (1)
|
|
{
|
|
struct list_links *first;
|
|
struct timer_node *timer = NULL;
|
|
|
|
/* While the timer queue is not empty, inspect the first node. */
|
|
first = list_first (&self->timer_queue);
|
|
if (first != list_null (&self->timer_queue))
|
|
{
|
|
struct timespec now;
|
|
|
|
timer = timer_links2ptr (first);
|
|
|
|
/* This assumes that the elements of the list of one thread
|
|
are all for the same clock. */
|
|
clock_gettime (timer->clock, &now);
|
|
|
|
while (1)
|
|
{
|
|
/* If the timer is due or overdue, remove it from the queue.
|
|
If it's a periodic timer, re-compute its new time and
|
|
requeue it. Either way, perform the timer expiry. */
|
|
if (timespec_compare (&now, &timer->expirytime) < 0)
|
|
break;
|
|
|
|
list_unlink_ip (first);
|
|
|
|
if (__builtin_expect (timer->value.it_interval.tv_sec, 0) != 0
|
|
|| timer->value.it_interval.tv_nsec != 0)
|
|
{
|
|
timer->overrun_count = 0;
|
|
timespec_add (&timer->expirytime, &timer->expirytime,
|
|
&timer->value.it_interval);
|
|
while (timespec_compare (&timer->expirytime, &now) < 0)
|
|
{
|
|
timespec_add (&timer->expirytime, &timer->expirytime,
|
|
&timer->value.it_interval);
|
|
if (timer->overrun_count < DELAYTIMER_MAX)
|
|
++timer->overrun_count;
|
|
}
|
|
__timer_thread_queue_timer (self, timer);
|
|
}
|
|
|
|
thread_expire_timer (self, timer);
|
|
|
|
first = list_first (&self->timer_queue);
|
|
if (first == list_null (&self->timer_queue))
|
|
break;
|
|
|
|
timer = timer_links2ptr (first);
|
|
}
|
|
}
|
|
|
|
/* If the queue is not empty, wait until the expiry time of the
|
|
first node. Otherwise wait indefinitely. Insertions at the
|
|
head of the queue must wake up the thread by broadcasting
|
|
this condition variable. */
|
|
if (timer != NULL)
|
|
pthread_cond_timedwait (&self->cond, &__timer_mutex,
|
|
&timer->expirytime);
|
|
else
|
|
pthread_cond_wait (&self->cond, &__timer_mutex);
|
|
}
|
|
/* This macro will never be executed since the while loop loops
|
|
forever - but we have to add it for proper nesting. */
|
|
pthread_cleanup_pop (1);
|
|
}
|
|
|
|
|
|
/* Enqueue a timer in wakeup order in the thread's timer queue.
|
|
Returns 1 if the timer was inserted at the head of the queue,
|
|
causing the queue's next wakeup time to change. */
|
|
|
|
int
|
|
__timer_thread_queue_timer (struct thread_node *thread,
|
|
struct timer_node *insert)
|
|
{
|
|
struct list_links *iter;
|
|
int athead = 1;
|
|
|
|
for (iter = list_first (&thread->timer_queue);
|
|
iter != list_null (&thread->timer_queue);
|
|
iter = list_next (iter))
|
|
{
|
|
struct timer_node *timer = timer_links2ptr (iter);
|
|
|
|
if (timespec_compare (&insert->expirytime, &timer->expirytime) < 0)
|
|
break;
|
|
athead = 0;
|
|
}
|
|
|
|
list_insbefore (iter, &insert->links);
|
|
return athead;
|
|
}
|
|
|
|
|
|
/* Start a thread and associate it with the given thread node. Global
|
|
lock must be held by caller. */
|
|
int
|
|
__timer_thread_start (struct thread_node *thread)
|
|
{
|
|
int retval = 1;
|
|
|
|
assert (!thread->exists);
|
|
thread->exists = 1;
|
|
|
|
if (pthread_create (&thread->id, &thread->attr,
|
|
(void *(*) (void *)) thread_func, thread) != 0)
|
|
{
|
|
thread->exists = 0;
|
|
retval = -1;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
|
|
void
|
|
__timer_thread_wakeup (struct thread_node *thread)
|
|
{
|
|
pthread_cond_broadcast (&thread->cond);
|
|
}
|
|
|
|
|
|
/* Compare two pthread_attr_t thread attributes for exact equality.
|
|
Returns 1 if they are equal, otherwise zero if they are not equal or
|
|
contain illegal values. This version is LinuxThreads-specific for
|
|
performance reason. One could use the access functions to get the
|
|
values of all the fields of the attribute structure. */
|
|
static int
|
|
thread_attr_compare (const pthread_attr_t *left, const pthread_attr_t *right)
|
|
{
|
|
struct pthread_attr *ileft = (struct pthread_attr *) left;
|
|
struct pthread_attr *iright = (struct pthread_attr *) right;
|
|
|
|
return (ileft->flags == iright->flags
|
|
&& ileft->schedpolicy == iright->schedpolicy
|
|
&& (ileft->schedparam.sched_priority
|
|
== iright->schedparam.sched_priority));
|
|
}
|
|
|
|
|
|
/* Search the list of active threads and find one which has matching
|
|
attributes. Global mutex lock must be held by caller. */
|
|
struct thread_node *
|
|
__timer_thread_find_matching (const pthread_attr_t *desired_attr,
|
|
clockid_t desired_clock_id)
|
|
{
|
|
struct list_links *iter = list_first (&thread_active_list);
|
|
|
|
while (iter != list_null (&thread_active_list))
|
|
{
|
|
struct thread_node *candidate = thread_links2ptr (iter);
|
|
|
|
if (thread_attr_compare (desired_attr, &candidate->attr)
|
|
&& desired_clock_id == candidate->clock_id)
|
|
{
|
|
list_unlink (iter);
|
|
return candidate;
|
|
}
|
|
|
|
iter = list_next (iter);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/* Grab a free timer structure from the global free list. The global
|
|
lock must be held by the caller. */
|
|
struct timer_node *
|
|
__timer_alloc (void)
|
|
{
|
|
struct list_links *node = list_first (&timer_free_list);
|
|
|
|
if (node != list_null (&timer_free_list))
|
|
{
|
|
struct timer_node *timer = timer_links2ptr (node);
|
|
list_unlink_ip (node);
|
|
timer->inuse = TIMER_INUSE;
|
|
timer->refcount = 1;
|
|
return timer;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/* Return a timer structure to the global free list. The global lock
|
|
must be held by the caller. */
|
|
void
|
|
__timer_dealloc (struct timer_node *timer)
|
|
{
|
|
assert (timer->refcount == 0);
|
|
timer->thread = NULL; /* Break association between timer and thread. */
|
|
timer->inuse = TIMER_FREE;
|
|
list_append (&timer_free_list, &timer->links);
|
|
}
|
|
|
|
|
|
/* Thread cancellation handler which unlocks a mutex. */
|
|
void
|
|
__timer_mutex_cancel_handler (void *arg)
|
|
{
|
|
pthread_mutex_unlock (arg);
|
|
}
|