libc/include/pthread.h

/*
 * Copyright (C) 2008 The Android Open Source Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _PTHREAD_H_
#define _PTHREAD_H_

#include <limits.h>
#include <bits/pthread_types.h>
#include <sched.h>
#include <sys/cdefs.h>
#include <sys/types.h>
#include <time.h>

__BEGIN_DECLS

enum {
    PTHREAD_MUTEX_NORMAL = 0,
    PTHREAD_MUTEX_RECURSIVE = 1,
    PTHREAD_MUTEX_ERRORCHECK = 2,

    PTHREAD_MUTEX_ERRORCHECK_NP = PTHREAD_MUTEX_ERRORCHECK,
    PTHREAD_MUTEX_RECURSIVE_NP  = PTHREAD_MUTEX_RECURSIVE,

    PTHREAD_MUTEX_DEFAULT = PTHREAD_MUTEX_NORMAL
};

#define PTHREAD_MUTEX_INITIALIZER { { ((PTHREAD_MUTEX_NORMAL & 3) << 14) } }
#define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP { { ((PTHREAD_MUTEX_RECURSIVE & 3) << 14) } }
#define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP { { ((PTHREAD_MUTEX_ERRORCHECK & 3) << 14) } }

#define PTHREAD_COND_INITIALIZER  { { 0 } }

#define PTHREAD_RWLOCK_INITIALIZER  { { 0 } }

enum {
  PTHREAD_RWLOCK_PREFER_READER_NP = 0,
  PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP = 1,
};

#define PTHREAD_ONCE_INIT 0

#if __ANDROID_API__ >= __ANDROID_API_N__
#define PTHREAD_BARRIER_SERIAL_THREAD -1
#endif

#if defined(__LP64__)
#define PTHREAD_STACK_MIN (4 * PAGE_SIZE)
#else
#define PTHREAD_STACK_MIN (2 * PAGE_SIZE)
#endif

#define PTHREAD_CREATE_DETACHED  0x00000001
#define PTHREAD_CREATE_JOINABLE  0x00000000

#define PTHREAD_PROCESS_PRIVATE  0
#define PTHREAD_PROCESS_SHARED   1

#define PTHREAD_SCOPE_SYSTEM     0
#define PTHREAD_SCOPE_PROCESS    1

int pthread_atfork(void (*)(void), void (*)(void), void (*)(void)) __INTRODUCED_IN(12);

int pthread_attr_destroy(pthread_attr_t*);
int pthread_attr_getdetachstate(const pthread_attr_t*, int*);
int pthread_attr_getguardsize(const pthread_attr_t*, size_t*);
int pthread_attr_getschedparam(const pthread_attr_t*, struct sched_param*);
int pthread_attr_getschedpolicy(const pthread_attr_t*, int*);
int pthread_attr_getscope(const pthread_attr_t*, int*);
int pthread_attr_getstack(const pthread_attr_t*, void**, size_t*);
int pthread_attr_getstacksize(const pthread_attr_t*, size_t*);
int pthread_attr_init(pthread_attr_t*);
int pthread_attr_setdetachstate(pthread_attr_t*, int);
int pthread_attr_setguardsize(pthread_attr_t*, size_t);
int pthread_attr_setschedparam(pthread_attr_t*, const struct sched_param*);
int pthread_attr_setschedpolicy(pthread_attr_t*, int);
int pthread_attr_setscope(pthread_attr_t*, int);
int pthread_attr_setstack(pthread_attr_t*, void*, size_t);
int pthread_attr_setstacksize(pthread_attr_t*, size_t);

int pthread_condattr_destroy(pthread_condattr_t*);
int pthread_condattr_getclock(const pthread_condattr_t*, clockid_t*) __INTRODUCED_IN(21);
int pthread_condattr_getpshared(const pthread_condattr_t*, int*);
int pthread_condattr_init(pthread_condattr_t*);
int pthread_condattr_setclock(pthread_condattr_t*, clockid_t) __INTRODUCED_IN(21);
int pthread_condattr_setpshared(pthread_condattr_t*, int);

int pthread_cond_broadcast(pthread_cond_t*);
int pthread_cond_destroy(pthread_cond_t*);
int pthread_cond_init(pthread_cond_t*, const pthread_condattr_t*);
int pthread_cond_signal(pthread_cond_t*);
int pthread_cond_timedwait(pthread_cond_t*, pthread_mutex_t*, const struct timespec*);
int pthread_cond_wait(pthread_cond_t*, pthread_mutex_t*);

int pthread_create(pthread_t*, pthread_attr_t const*, void* (*start_routine)(void*), void*);
int pthread_detach(pthread_t);
void pthread_exit(void*) __noreturn;

int pthread_equal(pthread_t, pthread_t);

int pthread_getattr_np(pthread_t, pthread_attr_t*);

int pthread_getcpuclockid(pthread_t, clockid_t*);

int pthread_getschedparam(pthread_t, int*, struct sched_param*);

void* pthread_getspecific(pthread_key_t);

pid_t pthread_gettid_np(pthread_t) __INTRODUCED_IN(21);

int pthread_join(pthread_t, void**);

int pthread_key_create(pthread_key_t*, void (*)(void*));
int pthread_key_delete(pthread_key_t);

int pthread_mutexattr_destroy(pthread_mutexattr_t*);
int pthread_mutexattr_getpshared(const pthread_mutexattr_t*, int*);
int pthread_mutexattr_gettype(const pthread_mutexattr_t*, int*);
int pthread_mutexattr_init(pthread_mutexattr_t*);
int pthread_mutexattr_setpshared(pthread_mutexattr_t*, int);
int pthread_mutexattr_settype(pthread_mutexattr_t*, int);

int pthread_mutex_destroy(pthread_mutex_t*);
int pthread_mutex_init(pthread_mutex_t*, const pthread_mutexattr_t*);
int pthread_mutex_lock(pthread_mutex_t*);
int pthread_mutex_timedlock(pthread_mutex_t*, const struct timespec* )
  __INTRODUCED_IN(21);
int pthread_mutex_trylock(pthread_mutex_t*);
int pthread_mutex_unlock(pthread_mutex_t*);

#if __ANDROID_API__ < 21
/*
 * Cruft for supporting old API levels. Pre-L we didn't have the proper POSIX
 * APIs for things, but instead had some locally grown, artisan equivalents.
 * Keep exposing the old prototypes on old API levels so we don't regress
 * functionality.
 *
 * See the following bugs:
 *  * https://github.com/android-ndk/ndk/issues/420
 *  * https://github.com/android-ndk/ndk/issues/423
 *  * https://stackoverflow.com/q/44580542/632035
 */
int pthread_mutex_lock_timeout_np(pthread_mutex_t* mutex, unsigned msecs);
int pthread_cond_timeout_np(pthread_cond_t* cond, pthread_mutex_t* mutex, unsigned msecs);
int pthread_cond_timedwait_monotonic_np(pthread_cond_t*, pthread_mutex_t*, const struct timespec*);
int pthread_cond_timedwait_relative_np(pthread_cond_t* cond, pthread_mutex_t* mutex,
                                       const struct timespec* reltime);
#endif

int pthread_once(pthread_once_t*, void (*init_routine)(void));

int pthread_rwlockattr_init(pthread_rwlockattr_t*);
int pthread_rwlockattr_destroy(pthread_rwlockattr_t*);
int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t*, int*);
int pthread_rwlockattr_setpshared(pthread_rwlockattr_t*, int);
int pthread_rwlockattr_getkind_np(const pthread_rwlockattr_t*, int*)
  __INTRODUCED_IN(23);
int pthread_rwlockattr_setkind_np(pthread_rwlockattr_t*, int) __INTRODUCED_IN(23);

int pthread_rwlock_destroy(pthread_rwlock_t*);
int pthread_rwlock_init(pthread_rwlock_t*, const pthread_rwlockattr_t*);
int pthread_rwlock_rdlock(pthread_rwlock_t*);
int pthread_rwlock_timedrdlock(pthread_rwlock_t*, const struct timespec*);
int pthread_rwlock_timedwrlock(pthread_rwlock_t*, const struct timespec*);
int pthread_rwlock_tryrdlock(pthread_rwlock_t*);
int pthread_rwlock_trywrlock(pthread_rwlock_t*);
int pthread_rwlock_unlock(pthread_rwlock_t*);
int pthread_rwlock_wrlock(pthread_rwlock_t*);

#if __ANDROID_API__ >= __ANDROID_API_N__
int pthread_barrierattr_init(pthread_barrierattr_t* attr) __INTRODUCED_IN(24);
int pthread_barrierattr_destroy(pthread_barrierattr_t* attr) __INTRODUCED_IN(24);
int pthread_barrierattr_getpshared(const pthread_barrierattr_t* attr,
                                   int* pshared) __INTRODUCED_IN(24);
int pthread_barrierattr_setpshared(pthread_barrierattr_t* attr, int pshared)
  __INTRODUCED_IN(24);
#endif

#if __ANDROID_API__ >= __ANDROID_API_N__
int pthread_barrier_init(pthread_barrier_t*, const pthread_barrierattr_t*, unsigned)
  __INTRODUCED_IN(24);
int pthread_barrier_destroy(pthread_barrier_t*) __INTRODUCED_IN(24);
int pthread_barrier_wait(pthread_barrier_t*) __INTRODUCED_IN(24);
#endif

#if __ANDROID_API__ >= __ANDROID_API_N__
int pthread_spin_destroy(pthread_spinlock_t*) __INTRODUCED_IN(24);
int pthread_spin_init(pthread_spinlock_t*, int) __INTRODUCED_IN(24);
int pthread_spin_lock(pthread_spinlock_t*) __INTRODUCED_IN(24);
int pthread_spin_trylock(pthread_spinlock_t*) __INTRODUCED_IN(24);
int pthread_spin_unlock(pthread_spinlock_t*) __INTRODUCED_IN(24);
#endif

pthread_t pthread_self(void) __attribute_const__;

#if defined(__USE_GNU)
int pthread_getname_np(pthread_t, char*, size_t) __INTRODUCED_IN(26);
#endif
/* TODO: this should be __USE_GNU too. */
int pthread_setname_np(pthread_t, const char*);

int pthread_setschedparam(pthread_t, int, const struct sched_param*);

int pthread_setspecific(pthread_key_t, const void*);

typedef void (*__pthread_cleanup_func_t)(void*);

typedef struct __pthread_cleanup_t {
  struct __pthread_cleanup_t*   __cleanup_prev;
  __pthread_cleanup_func_t      __cleanup_routine;
  void*                         __cleanup_arg;
} __pthread_cleanup_t;

void __pthread_cleanup_push(__pthread_cleanup_t* c, __pthread_cleanup_func_t, void*);
void __pthread_cleanup_pop(__pthread_cleanup_t*, int);

/* Believe or not, the definitions of pthread_cleanup_push and
 * pthread_cleanup_pop below are correct. Posix states that these
 * can be implemented as macros that might introduce opening and
 * closing braces, and that using setjmp/longjmp/return/break/continue
 * between them results in undefined behavior.
 */
#define  pthread_cleanup_push(routine, arg)                      \
    do {                                                         \
        __pthread_cleanup_t  __cleanup;                          \
        __pthread_cleanup_push( &__cleanup, (routine), (arg) );  \

#define  pthread_cleanup_pop(execute)                  \
        __pthread_cleanup_pop( &__cleanup, (execute)); \
    } while (0);                                       \

__END_DECLS

#endif /* _PTHREAD_H_ */