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platform_bionic/libc/include/pthread.h
Elliott Hughes 8aecba7aa6 Implement pthread_attr_getinheritsched/pthread_attr_setinheritsched. 
Historically, Android defaulted to EXPLICIT but with a special case
because SCHED_NORMAL/priority 0 was awkward. Because the code couldn't
actually tell whether SCHED_NORMAL/priority 0 was a genuine attempt to
explicitly set those attributes (because the parent thread is SCHED_FIFO,
say) or just because the pthread_attr_t was left at its defaults.

Now we support INHERIT, we could call sched_getscheduler to see whether
we actually need to call sched_setscheduler, but since the major cost
is the fixed syscall overhead, we may as well just conservatively
call sched_setscheduler and let the kernel decide whether it's a
no-op. (Especially because we'd then have to add both sched_getscheduler
and sched_setscheduler to any seccomp filter.)

Platform code (or app code that only needs to support >= P) can actually
add a call to pthread_attr_setinheritsched to say that they just want
to inherit (if they know that none of their threads actually mess with
scheduler attributes at all), which will save them a sched_setscheduler
call except in the doubly-special case of SCHED_RESET_ON_FORK (which we
do handle).

An alternative would be "make pthread_attr_setschedparams and
pthread_attr_setschedprio set EXPLICIT and change the platform default
to INHERIT", but even though I can only think of weird pathological
examples where anyone would notice that change, that behavior -- of
pthread_attr_setschedparams/pthread_attr_setschedprio overriding an
earlier call to pthread_attr_setinheritsched -- isn't allowed by POSIX
(whereas defaulting to EXPLICIT is).

If we have a lot of trouble with this change in the app compatibility
testing phase, though, we'll want to reconsider this decision!

 -*-

This change also removes a comment about setting the scheduler attributes
in main_thread because we'd have to actually keep them up to date,
and it's not clear that doing so would be worth the trouble.

Also make async_safe_format_log preserve errno so we don't have to be
so careful around it.

Bug: http://b/67471710
Test: ran tests
Change-Id: Idd026c4ce78a536656adcb57aa2e7b2c616eeddf
2017-10-25 14:28:42 -07:00

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/*
* 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 1
#define PTHREAD_CREATE_JOINABLE 0
#define PTHREAD_EXPLICIT_SCHED 0
#define PTHREAD_INHERIT_SCHED 1
#define PTHREAD_PROCESS_PRIVATE 0
#define PTHREAD_PROCESS_SHARED 1
#define PTHREAD_SCOPE_SYSTEM 0
#define PTHREAD_SCOPE_PROCESS 1
int pthread_atfork(void (*__prepare)(void), void (*__parent)(void), void (*__child)(void)) __INTRODUCED_IN(12);
int pthread_attr_destroy(pthread_attr_t* __attr);
int pthread_attr_getdetachstate(const pthread_attr_t* __attr, int* __state);
int pthread_attr_getguardsize(const pthread_attr_t* __attr, size_t* __size);
int pthread_attr_getinheritsched(const pthread_attr_t* __attr, int* __flag);
int pthread_attr_getschedparam(const pthread_attr_t* __attr, struct sched_param* __param);
int pthread_attr_getschedpolicy(const pthread_attr_t* __attr, int* __policy);
int pthread_attr_getscope(const pthread_attr_t* __attr, int* __scope);
int pthread_attr_getstack(const pthread_attr_t* __attr, void** __addr, size_t* __size);
int pthread_attr_getstacksize(const pthread_attr_t* __attr, size_t* __size);
int pthread_attr_init(pthread_attr_t* __attr);
int pthread_attr_setdetachstate(pthread_attr_t* __attr, int __state);
int pthread_attr_setguardsize(pthread_attr_t* __attr, size_t __size);
int pthread_attr_setinheritsched(pthread_attr_t* __attr, int __flag);
int pthread_attr_setschedparam(pthread_attr_t* __attr, const struct sched_param* __param);
int pthread_attr_setschedpolicy(pthread_attr_t* __attr, int __policy);
int pthread_attr_setscope(pthread_attr_t* __attr, int __scope);
int pthread_attr_setstack(pthread_attr_t* __attr, void* __addr, size_t __size);
int pthread_attr_setstacksize(pthread_attr_t* __addr, size_t __size);
int pthread_condattr_destroy(pthread_condattr_t* __attr);
int pthread_condattr_getclock(const pthread_condattr_t* __attr, clockid_t* __clock) __INTRODUCED_IN(21);
int pthread_condattr_getpshared(const pthread_condattr_t* __attr, int* __shared);
int pthread_condattr_init(pthread_condattr_t* __attr);
int pthread_condattr_setclock(pthread_condattr_t* __attr, clockid_t __clock) __INTRODUCED_IN(21);
int pthread_condattr_setpshared(pthread_condattr_t* __attr, int __shared);
int pthread_cond_broadcast(pthread_cond_t* __cond);
int pthread_cond_destroy(pthread_cond_t* __cond);
int pthread_cond_init(pthread_cond_t* __cond, const pthread_condattr_t* __attr);
int pthread_cond_signal(pthread_cond_t* __cond);
int pthread_cond_timedwait(pthread_cond_t* __cond, pthread_mutex_t* __mutex, const struct timespec* __timeout);
int pthread_cond_wait(pthread_cond_t* __cond, pthread_mutex_t* __mutex);
int pthread_create(pthread_t* __pthread_ptr, pthread_attr_t const* __attr, void* (*__start_routine)(void*), void*);
int pthread_detach(pthread_t __pthread);
void pthread_exit(void* __return_value) __noreturn;
int pthread_equal(pthread_t __lhs, pthread_t __rhs);
int pthread_getattr_np(pthread_t __pthread, pthread_attr_t* __attr);
int pthread_getcpuclockid(pthread_t __pthread, clockid_t* __clock);
int pthread_getschedparam(pthread_t __pthread, int* __policy, struct sched_param* __param);
void* pthread_getspecific(pthread_key_t __key);
pid_t pthread_gettid_np(pthread_t __pthread) __INTRODUCED_IN(21);
int pthread_join(pthread_t __pthread, void** __return_value_ptr);
int pthread_key_create(pthread_key_t* __key_ptr, void (*__key_destructor)(void*));
int pthread_key_delete(pthread_key_t __key);
int pthread_mutexattr_destroy(pthread_mutexattr_t* __attr);
int pthread_mutexattr_getpshared(const pthread_mutexattr_t* __attr, int* __shared);
int pthread_mutexattr_gettype(const pthread_mutexattr_t* __attr, int* __type);
int pthread_mutexattr_init(pthread_mutexattr_t* __attr);
int pthread_mutexattr_setpshared(pthread_mutexattr_t* __attr, int __shared);
int pthread_mutexattr_settype(pthread_mutexattr_t* __attr, int __type);
int pthread_mutex_destroy(pthread_mutex_t* __mutex);
int pthread_mutex_init(pthread_mutex_t* __mutex, const pthread_mutexattr_t* __attr);
int pthread_mutex_lock(pthread_mutex_t* __mutex);
int pthread_mutex_timedlock(pthread_mutex_t* __mutex, const struct timespec* __timeout)
__INTRODUCED_IN(21);
int pthread_mutex_trylock(pthread_mutex_t* __mutex);
int pthread_mutex_unlock(pthread_mutex_t* __mutex);
#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 __timeout_ms);
int pthread_cond_timeout_np(pthread_cond_t* __cond, pthread_mutex_t* __mutex, unsigned __timeout_ms);
int pthread_cond_timedwait_monotonic_np(pthread_cond_t* __cond, pthread_mutex_t* __mutex, const struct timespec* __timeout);
int pthread_cond_timedwait_relative_np(pthread_cond_t* __cond, pthread_mutex_t* __mutex, const struct timespec* __relative_timeout);
#endif
int pthread_once(pthread_once_t* __once, void (*__init_routine)(void));
int pthread_rwlockattr_init(pthread_rwlockattr_t* __attr);
int pthread_rwlockattr_destroy(pthread_rwlockattr_t* __attr);
int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t* __attr, int* __shared);
int pthread_rwlockattr_setpshared(pthread_rwlockattr_t* __attr, int __shared);
int pthread_rwlockattr_getkind_np(const pthread_rwlockattr_t* __attr, int* __kind)
__INTRODUCED_IN(23);
int pthread_rwlockattr_setkind_np(pthread_rwlockattr_t* __attr, int __kind) __INTRODUCED_IN(23);
int pthread_rwlock_destroy(pthread_rwlock_t* __rwlock);
int pthread_rwlock_init(pthread_rwlock_t* __rwlock, const pthread_rwlockattr_t* __attr);
int pthread_rwlock_rdlock(pthread_rwlock_t* __rwlock);
int pthread_rwlock_timedrdlock(pthread_rwlock_t* __rwlock, const struct timespec* __timeout);
int pthread_rwlock_timedwrlock(pthread_rwlock_t* __rwlock, const struct timespec* __timeout);
int pthread_rwlock_tryrdlock(pthread_rwlock_t* __rwlock);
int pthread_rwlock_trywrlock(pthread_rwlock_t* __rwlock);
int pthread_rwlock_unlock(pthread_rwlock_t* __rwlock);
int pthread_rwlock_wrlock(pthread_rwlock_t* __rwlock);
#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* __shared) __INTRODUCED_IN(24);
int pthread_barrierattr_setpshared(pthread_barrierattr_t* __attr, int __shared) __INTRODUCED_IN(24);
#endif
#if __ANDROID_API__ >= __ANDROID_API_N__
int pthread_barrier_init(pthread_barrier_t* __barrier, const pthread_barrierattr_t* __attr, unsigned __count) __INTRODUCED_IN(24);
int pthread_barrier_destroy(pthread_barrier_t* __barrier) __INTRODUCED_IN(24);
int pthread_barrier_wait(pthread_barrier_t* __barrier) __INTRODUCED_IN(24);
#endif
#if __ANDROID_API__ >= __ANDROID_API_N__
int pthread_spin_destroy(pthread_spinlock_t* __spinlock) __INTRODUCED_IN(24);
int pthread_spin_init(pthread_spinlock_t* __spinlock, int __shared) __INTRODUCED_IN(24);
int pthread_spin_lock(pthread_spinlock_t* __spinlock) __INTRODUCED_IN(24);
int pthread_spin_trylock(pthread_spinlock_t* __spinlock) __INTRODUCED_IN(24);
int pthread_spin_unlock(pthread_spinlock_t* __spinlock) __INTRODUCED_IN(24);
#endif
pthread_t pthread_self(void) __attribute_const__;
#if defined(__USE_GNU)
int pthread_getname_np(pthread_t __pthread, char* __buf, size_t __n) __INTRODUCED_IN(26);
#endif
/* TODO: this should be __USE_GNU too. */
int pthread_setname_np(pthread_t __pthread, const char* __name);
int pthread_setschedparam(pthread_t __pthread, int __policy, const struct sched_param* __param);
int pthread_setschedprio(pthread_t __pthread, int __priority) __INTRODUCED_IN_FUTURE;
int pthread_setspecific(pthread_key_t __key, const void* __value);
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
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