pthread.zip

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  • 2021-02-08 18:50
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PThread header file, with annotations
pthread.zip
  • pthread.h
    39.7KB
内容介绍
/* Copyright (C) 2002-2020 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; if not, see <https://www.gnu.org/licenses/>. */ #ifndef _PTHREAD_H #define _PTHREAD_H 1 #include <features.h> #include <sched.h> #include <time.h> #include <bits/endian.h> #include <bits/pthreadtypes.h> #include <bits/setjmp.h> #include <bits/wordsize.h> #include <bits/types/struct_timespec.h> /* Detach state. */ enum { PTHREAD_CREATE_JOINABLE, #define PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_DETACHED #define PTHREAD_CREATE_DETACHED PTHREAD_CREATE_DETACHED }; /* Mutex types. */ enum { PTHREAD_MUTEX_TIMED_NP, PTHREAD_MUTEX_RECURSIVE_NP, PTHREAD_MUTEX_ERRORCHECK_NP, PTHREAD_MUTEX_ADAPTIVE_NP #if defined __USE_UNIX98 || defined __USE_XOPEN2K8 , PTHREAD_MUTEX_NORMAL = PTHREAD_MUTEX_TIMED_NP, PTHREAD_MUTEX_RECURSIVE = PTHREAD_MUTEX_RECURSIVE_NP, PTHREAD_MUTEX_ERRORCHECK = PTHREAD_MUTEX_ERRORCHECK_NP, PTHREAD_MUTEX_DEFAULT = PTHREAD_MUTEX_NORMAL #endif #ifdef __USE_GNU /* For compatibility. */ , PTHREAD_MUTEX_FAST_NP = PTHREAD_MUTEX_TIMED_NP #endif }; #ifdef __USE_XOPEN2K /* Robust mutex or not flags. */ enum { PTHREAD_MUTEX_STALLED, PTHREAD_MUTEX_STALLED_NP = PTHREAD_MUTEX_STALLED, PTHREAD_MUTEX_ROBUST, PTHREAD_MUTEX_ROBUST_NP = PTHREAD_MUTEX_ROBUST }; #endif #if defined __USE_POSIX199506 || defined __USE_UNIX98 /* Mutex protocols. */ enum { PTHREAD_PRIO_NONE, PTHREAD_PRIO_INHERIT, PTHREAD_PRIO_PROTECT }; #endif #define PTHREAD_MUTEX_INITIALIZER \ { { __PTHREAD_MUTEX_INITIALIZER (PTHREAD_MUTEX_TIMED_NP) } } #ifdef __USE_GNU # define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP \ { { __PTHREAD_MUTEX_INITIALIZER (PTHREAD_MUTEX_RECURSIVE_NP) } } # define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP \ { { __PTHREAD_MUTEX_INITIALIZER (PTHREAD_MUTEX_ERRORCHECK_NP) } } # define PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP \ { { __PTHREAD_MUTEX_INITIALIZER (PTHREAD_MUTEX_ADAPTIVE_NP) } } #endif /* Read-write lock types. */ #if defined __USE_UNIX98 || defined __USE_XOPEN2K enum { PTHREAD_RWLOCK_PREFER_READER_NP, PTHREAD_RWLOCK_PREFER_WRITER_NP, PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP, PTHREAD_RWLOCK_DEFAULT_NP = PTHREAD_RWLOCK_PREFER_READER_NP }; /* Read-write lock initializers. */ # define PTHREAD_RWLOCK_INITIALIZER \ { { __PTHREAD_RWLOCK_INITIALIZER (PTHREAD_RWLOCK_DEFAULT_NP) } } # ifdef __USE_GNU # define PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP \ { { __PTHREAD_RWLOCK_INITIALIZER (PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP) } } # endif #endif /* Unix98 or XOpen2K */ /* Scheduler inheritance. */ enum { PTHREAD_INHERIT_SCHED, #define PTHREAD_INHERIT_SCHED PTHREAD_INHERIT_SCHED PTHREAD_EXPLICIT_SCHED #define PTHREAD_EXPLICIT_SCHED PTHREAD_EXPLICIT_SCHED }; /* Scope handling. */ enum { PTHREAD_SCOPE_SYSTEM, #define PTHREAD_SCOPE_SYSTEM PTHREAD_SCOPE_SYSTEM PTHREAD_SCOPE_PROCESS #define PTHREAD_SCOPE_PROCESS PTHREAD_SCOPE_PROCESS }; /* Process shared or private flag. */ enum { PTHREAD_PROCESS_PRIVATE, #define PTHREAD_PROCESS_PRIVATE PTHREAD_PROCESS_PRIVATE PTHREAD_PROCESS_SHARED #define PTHREAD_PROCESS_SHARED PTHREAD_PROCESS_SHARED }; /* Conditional variable handling. */ #define PTHREAD_COND_INITIALIZER { { {0}, {0}, {0, 0}, {0, 0}, 0, 0, {0, 0} } } /* Cleanup buffers */ struct _pthread_cleanup_buffer { void (*__routine) (void *); /* Function to call. */ void *__arg; /* Its argument. */ int __canceltype; /* Saved cancellation type. */ struct _pthread_cleanup_buffer *__prev; /* Chaining of cleanup functions. */ }; /* Cancellation */ enum { PTHREAD_CANCEL_ENABLE, #define PTHREAD_CANCEL_ENABLE PTHREAD_CANCEL_ENABLE PTHREAD_CANCEL_DISABLE #define PTHREAD_CANCEL_DISABLE PTHREAD_CANCEL_DISABLE }; enum { PTHREAD_CANCEL_DEFERRED, #define PTHREAD_CANCEL_DEFERRED PTHREAD_CANCEL_DEFERRED PTHREAD_CANCEL_ASYNCHRONOUS #define PTHREAD_CANCEL_ASYNCHRONOUS PTHREAD_CANCEL_ASYNCHRONOUS }; #define PTHREAD_CANCELED ((void *) -1) /* Single execution handling. */ #define PTHREAD_ONCE_INIT 0 #ifdef __USE_XOPEN2K /* Value returned by 'pthread_barrier_wait' for one of the threads after the required number of threads have called this function. -1 is distinct from 0 and all errno constants */ # define PTHREAD_BARRIER_SERIAL_THREAD -1 #endif __BEGIN_DECLS /* Create a new thread, starting with execution of START-ROUTINE getting passed ARG. Creation attributed come from ATTR. The new handle is stored in *NEWTHREAD. */ extern int pthread_create (pthread_t *__restrict __newthread, const pthread_attr_t *__restrict __attr, void *(*__start_routine) (void *), void *__restrict __arg) __THROWNL __nonnull ((1, 3)); /* Terminate calling thread. The registered cleanup handlers are called via exception handling so we cannot mark this function with __THROW.*/ extern void pthread_exit (void *__retval) __attribute__ ((__noreturn__)); /* Make calling thread wait for termination of the thread TH. The exit status of the thread is stored in *THREAD_RETURN, if THREAD_RETURN is not NULL. This function is a cancellation point and therefore not marked with __THROW. */ extern int pthread_join (pthread_t __th, void **__thread_return); #ifdef __USE_GNU /* Check whether thread TH has terminated. If yes return the status of the thread in *THREAD_RETURN, if THREAD_RETURN is not NULL. */ extern int pthread_tryjoin_np (pthread_t __th, void **__thread_return) __THROW; /* Make calling thread wait for termination of the thread TH, but only until TIMEOUT. The exit status of the thread is stored in *THREAD_RETURN, if THREAD_RETURN is not NULL. This function is a cancellation point and therefore not marked with __THROW. */ extern int pthread_timedjoin_np (pthread_t __th, void **__thread_return, const struct timespec *__abstime); /* Make calling thread wait for termination of the thread TH, but only until TIMEOUT measured against the clock specified by CLOCKID. The exit status of the thread is stored in *THREAD_RETURN, if THREAD_RETURN is not NULL. This function is a cancellation point and therefore not marked with __THROW. */ extern int pthread_clockjoin_np (pthread_t __th, void **__thread_return, clockid_t __clockid, const struct timespec *__abstime); #endif /* Indicate that the thread TH is never to be joined with PTHREAD_JOIN. The resources of TH will therefore be freed immediately when it terminates, instead of waiting for another thread to perform PTHREAD_JOIN on it. */ extern int pthread_detach (pthread_t __th) __THROW; /* Obtain the identifier of the current thread. */ extern pthread_t pthread_self (void) __THROW __attribute__ ((__const__)); /* Compare two thread identifiers. */ extern int pthread_equal (pthread_t __thread1, pthread_t __thread2) __THROW __attribute__ ((__const__)); /* Thread attribute handling. */ /* Initialize thread attribute *ATTR with default attributes (detachstate is PTHREAD_JOINABLE, scheduling policy is SCHED_OTHER, no user-provided stack). */ extern int pthread_attr_init (pthread_attr_t *__attr) __THROW __nonnull ((1)); /* Destroy thread attribute *ATTR. */ extern int pthr
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