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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_INTERNAL_H_
#define _PTHREAD_INTERNAL_H_
#include <pthread.h>
#include <stdatomic.h>
#include "private/bionic_lock.h"
#include "private/bionic_tls.h"
/* Has the thread been detached by a pthread_join or pthread_detach call? */
#define PTHREAD_ATTR_FLAG_DETACHED 0x00000001
/* Has the thread been joined by another thread? */
#define PTHREAD_ATTR_FLAG_JOINED 0x00000002
class pthread_key_data_t {
public:
uintptr_t seq; // Use uintptr_t just for alignment, as we use pointer below.
void* data;
};
enum ThreadJoinState {
THREAD_NOT_JOINED,
THREAD_EXITED_NOT_JOINED,
THREAD_JOINED,
THREAD_DETACHED
};
class thread_local_dtor;
class pthread_internal_t {
public:
class pthread_internal_t* next;
class pthread_internal_t* prev;
pid_t tid;
private:
pid_t cached_pid_;
public:
pid_t invalidate_cached_pid() {
pid_t old_value;
get_cached_pid(&old_value);
set_cached_pid(0);
return old_value;
}
void set_cached_pid(pid_t value) {
cached_pid_ = value;
}
bool get_cached_pid(pid_t* cached_pid) {
*cached_pid = cached_pid_;
return (*cached_pid != 0);
}
pthread_attr_t attr;
_Atomic(ThreadJoinState) join_state;
__pthread_cleanup_t* cleanup_stack;
void* (*start_routine)(void*);
void* start_routine_arg;
void* return_value;
void* alternate_signal_stack;
Lock startup_handshake_lock;
size_t mmap_size;
thread_local_dtor* thread_local_dtors;
void* tls[BIONIC_TLS_SLOTS];
pthread_key_data_t key_data[BIONIC_PTHREAD_KEY_COUNT];
/*
* The dynamic linker implements dlerror(3), which makes it hard for us to implement this
* per-thread buffer by simply using malloc(3) and free(3).
*/
#define __BIONIC_DLERROR_BUFFER_SIZE 512
char dlerror_buffer[__BIONIC_DLERROR_BUFFER_SIZE];
bionic_tls* bionic_tls;
};
__LIBC_HIDDEN__ int __init_thread(pthread_internal_t* thread);
__LIBC_HIDDEN__ void __init_tls(pthread_internal_t* thread);
__LIBC_HIDDEN__ void __init_thread_stack_guard(pthread_internal_t* thread);
__LIBC_HIDDEN__ void __init_alternate_signal_stack(pthread_internal_t*);
__LIBC_HIDDEN__ pthread_t __pthread_internal_add(pthread_internal_t* thread);
__LIBC_HIDDEN__ pthread_internal_t* __pthread_internal_find(pthread_t pthread_id);
__LIBC_HIDDEN__ void __pthread_internal_remove(pthread_internal_t* thread);
__LIBC_HIDDEN__ void __pthread_internal_remove_and_free(pthread_internal_t* thread);
// Make __get_thread() inlined for performance reason. See http://b/19825434.
static inline __always_inline pthread_internal_t* __get_thread() {
void** tls = __get_tls();
if (__predict_true(tls)) {
return reinterpret_cast<pthread_internal_t*>(tls[TLS_SLOT_THREAD_ID]);
}
// This happens when called during libc initialization before TLS has been initialized.
return nullptr;
}
static inline __always_inline bionic_tls& __get_bionic_tls() {
return *__get_thread()->bionic_tls;
}
__LIBC_HIDDEN__ void pthread_key_clean_all(void);
// SIGSTKSZ (8kB) is not big enough.
// snprintf to a stack buffer of size PATH_MAX consumes ~7kB of stack.
// Also, on 64-bit, logging uses more than 8kB by itself:
// https://code.google.com/p/android/issues/detail?id=187064
#define SIGNAL_STACK_SIZE_WITHOUT_GUARD_PAGE (16 * 1024)
/*
* Traditionally we gave threads a 1MiB stack. When we started
* allocating per-thread alternate signal stacks to ease debugging of
* stack overflows, we subtracted the same amount we were using there
* from the default thread stack size. This should keep memory usage
* roughly constant.
*/
#define PTHREAD_STACK_SIZE_DEFAULT ((1 * 1024 * 1024) - SIGNAL_STACK_SIZE_WITHOUT_GUARD_PAGE)
// Leave room for a guard page in the internally created signal stacks.
#define SIGNAL_STACK_SIZE (SIGNAL_STACK_SIZE_WITHOUT_GUARD_PAGE + PAGE_SIZE)
/* Needed by fork. */
__LIBC_HIDDEN__ extern void __bionic_atfork_run_prepare();
__LIBC_HIDDEN__ extern void __bionic_atfork_run_child();
__LIBC_HIDDEN__ extern void __bionic_atfork_run_parent();
#endif /* _PTHREAD_INTERNAL_H_ */
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