glibc-linuxthreads-2.3.tar.gz

/* Linuxthreads - a simple clone()-based implementation of Posix */ /* threads for Linux. */ /* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ /* */ /* This program is free software; you can redistribute it and/or */ /* modify it under the terms of the GNU Library General Public License */ /* as published by the Free Software Foundation; either version 2 */ /* of the License, or (at your option) any later version. */ /* */ /* This program 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 Library General Public License for more details. */ /* Thread creation, initialization, and basic low-level routines */ #include <errno.h> #include <stddef.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <sys/wait.h> #include <sys/resource.h> #include <sys/time.h> #include <shlib-compat.h> #include "pthread.h" #include "internals.h" #include "spinlock.h" #include "restart.h" #include "smp.h" #include <ldsodefs.h> #include <tls.h> #include <locale.h> /* for __uselocale */ #include <version.h> /* Sanity check. */ #if __ASSUME_REALTIME_SIGNALS && !defined __SIGRTMIN # error "This must not happen; new kernel assumed but old headers" #endif #if !(USE_TLS && HAVE___THREAD) /* These variables are used by the setup code. */ extern int _errno; extern int _h_errno; /* We need the global/static resolver state here. */ # include <resolv.h> # undef _res extern struct __res_state _res; #endif #ifdef USE_TLS /* We need only a few variables. */ static pthread_descr manager_thread; #else /* Descriptor of the initial thread */ struct _pthread_descr_struct __pthread_initial_thread = { { { .self = &__pthread_initial_thread /* pthread_descr self */ } }, &__pthread_initial_thread, /* pthread_descr p_nextlive */ &__pthread_initial_thread, /* pthread_descr p_prevlive */ NULL, /* pthread_descr p_nextwaiting */ NULL, /* pthread_descr p_nextlock */ PTHREAD_THREADS_MAX, /* pthread_t p_tid */ 0, /* int p_pid */ 0, /* int p_priority */ &__pthread_handles[0].h_lock, /* struct _pthread_fastlock * p_lock */ 0, /* int p_signal */ NULL, /* sigjmp_buf * p_signal_buf */ NULL, /* sigjmp_buf * p_cancel_buf */ 0, /* char p_terminated */ 0, /* char p_detached */ 0, /* char p_exited */ NULL, /* void * p_retval */ 0, /* int p_retval */ NULL, /* pthread_descr p_joining */ NULL, /* struct _pthread_cleanup_buffer * p_cleanup */ 0, /* char p_cancelstate */ 0, /* char p_canceltype */ 0, /* char p_canceled */ NULL, /* char * p_in_sighandler */ 0, /* char p_sigwaiting */ PTHREAD_START_ARGS_INITIALIZER(NULL), /* struct pthread_start_args p_start_args */ {NULL}, /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */ {NULL}, /* void * p_libc_specific[_LIBC_TSD_KEY_N] */ &_errno, /* int *p_errnop */ 0, /* int p_errno */ &_h_errno, /* int *p_h_errnop */ 0, /* int p_h_errno */ &_res, /* struct __res_state *p_resp */ {}, /* struct __res_state p_res */ 1, /* int p_userstack */ NULL, /* void * p_guardaddr */ 0, /* size_t p_guardsize */ 0, /* Always index 0 */ 0, /* int p_report_events */ {{{0, }}, 0, NULL}, /* td_eventbuf_t p_eventbuf */ __ATOMIC_INITIALIZER, /* struct pthread_atomic p_resume_count */ 0, /* char p_woken_by_cancel */ 0, /* char p_condvar_avail */ 0, /* char p_sem_avail */ NULL, /* struct pthread_extricate_if *p_extricate */ NULL, /* pthread_readlock_info *p_readlock_list; */ NULL, /* pthread_readlock_info *p_readlock_free; */ 0 /* int p_untracked_readlock_count; */ }; /* Descriptor of the manager thread; none of this is used but the error variables, the p_pid and p_priority fields, and the address for identification. */ #define manager_thread (&__pthread_manager_thread) struct _pthread_descr_struct __pthread_manager_thread = { { { .self = &__pthread_manager_thread /* pthread_descr self */ } }, NULL, /* pthread_descr p_nextlive */ NULL, /* pthread_descr p_prevlive */ NULL, /* pthread_descr p_nextwaiting */ NULL, /* pthread_descr p_nextlock */ 0, /* int p_tid */ 0, /* int p_pid */ 0, /* int p_priority */ &__pthread_handles[1].h_lock, /* struct _pthread_fastlock * p_lock */ 0, /* int p_signal */ NULL, /* sigjmp_buf * p_signal_buf */ NULL, /* sigjmp_buf * p_cancel_buf */ 0, /* char p_terminated */ 0, /* char p_detached */ 0, /* char p_exited */ NULL, /* void * p_retval */ 0, /* int p_retval */ NULL, /* pthread_descr p_joining */ NULL, /* struct _pthread_cleanup_buffer * p_cleanup */ 0, /* char p_cancelstate */ 0, /* char p_canceltype */ 0, /* char p_canceled */ NULL, /* char * p_in_sighandler */ 0, /* char p_sigwaiting */ PTHREAD_START_ARGS_INITIALIZER(__pthread_manager), /* struct pthread_start_args p_start_args */ {NULL}, /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */ {NULL}, /* void * p_libc_specific[_LIBC_TSD_KEY_N] */ &__pthread_manager_thread.p_errno, /* int *p_errnop */ 0, /* int p_errno */ NULL, /* int *p_h_errnop */ 0, /* int p_h_errno */ NULL, /* struct __res_state *p_resp */ {}, /* struct __res_state p_res */ 0, /* int p_userstack */ NULL, /* void * p_guardaddr */ 0, /* size_t p_guardsize */ 1, /* Always index 1 */ 0, /* int p_report_events */ {{{0, }}, 0, NULL}, /* td_eventbuf_t p_eventbuf */ __ATOMIC_INITIALIZER, /* struct pthread_atomic p_resume_count */ 0, /* char p_woken_by_cancel */ 0, /* char p_condvar_avail */ 0, /* char p_sem_avail */ NULL, /* struct pthread_extricate_if *p_extricate */ NULL, /* pthread_readlock_info *p_readlock_list; */ NULL, /* pthread_readlock_info *p_readlock_free; */ 0 /* int p_untracked_readloc