glibc-linuxthreads-2.2.3.tar.gz

/* Linuxthreads - a simple clone()-based implementation of Posix */ /* threads for Linux. */ /* Copyright (C) 1996 Xavier Leroy ([email protected]) */ /* */ /* 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/sysctl.h> #include <shlib-compat.h> #include "pthread.h" #include "internals.h" #include "spinlock.h" #include "restart.h" /* We need the global/static resolver state here. */ #include <resolv.h> #undef _res extern struct __res_state _res; /* Sanity check. */ #if __ASSUME_REALTIME_SIGNALS && !defined __SIGRTMIN # error "This must not happen; new kernel assumed but old headers" #endif /* These variables are used by the setup code. */ extern int _errno; extern int _h_errno; /* Descriptor of the initial thread */ struct _pthread_descr_struct __pthread_initial_thread = { { { &__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 */ &_errno, /* int *p_errnop */ 0, /* int p_errno */ &_h_errno, /* int *p_h_errnop */ 0, /* int p_h_errno */ 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] */ 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. */ struct _pthread_descr_struct __pthread_manager_thread = { { { &__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 */ &__pthread_manager_thread.p_errno, /* int *p_errnop */ 0, /* int p_errno */ NULL, /* int *p_h_errnop */ 0, /* int p_h_errno */ 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] */ 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_readlock_count; */ }; /* Pointer to the main thread (the father of the thread manager thread) */ /* Originally, this is the initial thread, but this changes after fork() */ pthread_descr __pthread_main_thread = &__pthread_initial_thread; /* Limit between the stack of the initial thread (above) and the stacks of other threads (below). Aligned on a STACK_SIZE boundary. */ char *__pthread_initial_thread_bos; /* File descriptor for sending requests to the thread manager. */ /* Initially -1, meaning that the th