/* Copyright (C) 2002 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper , 2002. 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; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include /* XXX For the time being... */ #define __NR_set_tid_address 258 /* Default stack size. */ size_t __default_stacksize attribute_hidden; /* Size and alignment of static TLS block. */ size_t __static_tls_size; size_t __static_tls_align; /* Version of the library, used in libthread_db to detect mismatches. */ static const char nptl_version[] = VERSION; #if defined USE_TLS && !defined SHARED extern void __libc_setup_tls (size_t tcbsize, size_t tcbalign); #endif #ifdef SHARED static struct pthread_functions pthread_functions = { .ptr_pthread_attr_destroy = __pthread_attr_destroy, .ptr_pthread_attr_init = __pthread_attr_init_2_1, .ptr_pthread_attr_getdetachstate = __pthread_attr_getdetachstate, .ptr_pthread_attr_setdetachstate = __pthread_attr_setdetachstate, .ptr_pthread_attr_getinheritsched = __pthread_attr_getinheritsched, .ptr_pthread_attr_setinheritsched = __pthread_attr_setinheritsched, .ptr_pthread_attr_getschedparam = __pthread_attr_getschedparam, .ptr_pthread_attr_setschedparam = __pthread_attr_setschedparam, .ptr_pthread_attr_getschedpolicy = __pthread_attr_getschedpolicy, .ptr_pthread_attr_setschedpolicy = __pthread_attr_setschedpolicy, .ptr_pthread_attr_getscope = __pthread_attr_getscope, .ptr_pthread_attr_setscope = __pthread_attr_setscope, .ptr_pthread_condattr_destroy = __pthread_condattr_destroy, .ptr_pthread_condattr_init = __pthread_condattr_init, .ptr_pthread_cond_broadcast = __pthread_cond_broadcast, .ptr_pthread_cond_destroy = __pthread_cond_destroy, .ptr_pthread_cond_init = __pthread_cond_init, .ptr_pthread_cond_signal = __pthread_cond_signal, .ptr_pthread_cond_wait = __pthread_cond_wait, .ptr_pthread_equal = __pthread_equal, .ptr_pthread_exit = __pthread_exit, .ptr_pthread_getschedparam = __pthread_getschedparam, .ptr_pthread_setschedparam = __pthread_setschedparam, .ptr_pthread_mutex_destroy = INTUSE(__pthread_mutex_destroy), .ptr_pthread_mutex_init = INTUSE(__pthread_mutex_init), .ptr_pthread_mutex_lock = INTUSE(__pthread_mutex_lock), .ptr_pthread_mutex_unlock = INTUSE(__pthread_mutex_unlock), .ptr_pthread_self = __pthread_self, .ptr_pthread_setcancelstate = __pthread_setcancelstate, .ptr_pthread_setcanceltype = __pthread_setcanceltype }; # define ptr_pthread_functions &pthread_functions #else # define ptr_pthread_functions NULL #endif /* For asynchronous cancellation we use a signal. This is the handler. */ static void sigcancel_handler (int sig __attribute ((unused))) { struct pthread *self = THREAD_SELF; while (1) { /* We are canceled now. When canceled by another thread this flag is already set but if the signal is directly send (internally or from another process) is has to be done here. */ int oldval = THREAD_GETMEM (self, cancelhandling); int newval = oldval | CANCELED_BITMASK; if (oldval == newval || (oldval & EXITING_BITMASK) != 0) /* Already canceled or exiting. */ break; if (atomic_compare_and_exchange_acq (&self->cancelhandling, newval, oldval) == 0) { /* Set the return value. */ THREAD_SETMEM (self, result, PTHREAD_CANCELED); /* Make sure asynchronous cancellation is still enabled. */ if ((newval & CANCELTYPE_BITMASK) != 0) { /* The thread is exiting now. */ atomic_bit_set (&self->cancelhandling, EXITING_BIT); /* Run the registered destructors and terminate the thread. */ __do_cancel (); } break; } } } void #ifdef SHARED __attribute ((constructor)) #endif __pthread_initialize_minimal_internal (void) { #ifndef SHARED /* Unlike in the dynamically linked case the dynamic linker has not taken care of initializing the TLS data structures. */ __libc_setup_tls (TLS_TCB_SIZE, TLS_TCB_ALIGN); /* We must prevent gcc from being clever and move any of the following code ahead of the __libc_setup_tls call. This function will initialize the thread register which is subsequently used. */ __asm __volatile (""); #endif /* Minimal initialization of the thread descriptor. */ struct pthread *pd = THREAD_SELF; pd->tid = INTERNAL_SYSCALL (set_tid_address, 1, &pd->tid); THREAD_SETMEM (pd, specific[0], &pd->specific_1stblock[0]); THREAD_SETMEM (pd, user_stack, true); if (LLL_LOCK_INITIALIZER != 0) THREAD_SETMEM (pd, lock, LLL_LOCK_INITIALIZER); #if HP_TIMING_AVAIL THREAD_SETMEM (pd, cpuclock_offset, GL(dl_cpuclock_offset)); #endif /* Initialize the list of all running threads with the main thread. */ INIT_LIST_HEAD (&__stack_user); list_add (&pd->header.data.list, &__stack_user); /* Install the cancellation signal handler. If for some reason we cannot install the handler we do not abort. Maybe we should, but it is only asynchronous cancellation which is affected. */ struct sigaction sa; sa.sa_handler = sigcancel_handler; sa.sa_flags = 0; sigemptyset (&sa.sa_mask); (void) __libc_sigaction (SIGCANCEL, &sa, NULL); /* Determine the default allowed stack size. This is the size used in case the user does not specify one. */ struct rlimit limit; if (getrlimit (RLIMIT_STACK, &limit) != 0 || limit.rlim_cur == RLIM_INFINITY) /* The system limit is not usable. Use an architecture-specific default. */ limit.rlim_cur = ARCH_STACK_DEFAULT_SIZE; #ifdef NEED_SEPARATE_REGISTER_STACK __default_stacksize = MAX (limit.rlim_cur / 2, PTHREAD_STACK_MIN); #else __default_stacksize = MAX (limit.rlim_cur, PTHREAD_STACK_MIN); #endif /* The maximum page size better should be a multiple of the page size. */ assert (__default_stacksize % __sysconf (_SC_PAGESIZE) == 0); /* Get the size of the static and alignment requirements for the TLS block. */ _dl_get_tls_static_info (&__static_tls_size, &__static_tls_align); /* Make sure the size takes all the alignments into account. */ if (STACK_ALIGN > __static_tls_align) __static_tls_align = STACK_ALIGN; __static_tls_size = roundup (__static_tls_size, __static_tls_align); /* Register the fork generation counter with the libc. */ __libc_pthread_init (&__fork_generation, __reclaim_stacks, ptr_pthread_functions); } strong_alias (__pthread_initialize_minimal_internal, __pthread_initialize_minimal)