pthread_internal.h revision 9d0c79304d2413028aa5c213f7a567f00feccde5
1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28#ifndef _PTHREAD_INTERNAL_H_ 29#define _PTHREAD_INTERNAL_H_ 30 31#include <pthread.h> 32 33#include "private/bionic_tls.h" 34 35/* Has the thread been detached by a pthread_join or pthread_detach call? */ 36#define PTHREAD_ATTR_FLAG_DETACHED 0x00000001 37 38/* Has the thread been joined by another thread? */ 39#define PTHREAD_ATTR_FLAG_JOINED 0x00000002 40 41/* Did the thread exit without freeing pthread_internal_t? */ 42#define PTHREAD_ATTR_FLAG_ZOMBIE 0x00000004 43 44struct pthread_key_data_t { 45 uintptr_t seq; // Use uintptr_t just for alignment, as we use pointer below. 46 void* data; 47}; 48 49struct pthread_internal_t { 50 struct pthread_internal_t* next; 51 struct pthread_internal_t* prev; 52 53 pid_t tid; 54 55 private: 56 pid_t cached_pid_; 57 58 public: 59 pid_t invalidate_cached_pid() { 60 pid_t old_value; 61 get_cached_pid(&old_value); 62 set_cached_pid(0); 63 return old_value; 64 } 65 66 void set_cached_pid(pid_t value) { 67 cached_pid_ = value; 68 } 69 70 bool get_cached_pid(pid_t* cached_pid) { 71 *cached_pid = cached_pid_; 72 return (*cached_pid != 0); 73 } 74 75 pthread_attr_t attr; 76 77 __pthread_cleanup_t* cleanup_stack; 78 79 void* (*start_routine)(void*); 80 void* start_routine_arg; 81 void* return_value; 82 83 void* alternate_signal_stack; 84 85 pthread_mutex_t startup_handshake_mutex; 86 87 size_t mmap_size; 88 89 void* tls[BIONIC_TLS_SLOTS]; 90 91 pthread_key_data_t key_data[BIONIC_PTHREAD_KEY_COUNT]; 92 93 /* 94 * The dynamic linker implements dlerror(3), which makes it hard for us to implement this 95 * per-thread buffer by simply using malloc(3) and free(3). 96 */ 97#define __BIONIC_DLERROR_BUFFER_SIZE 512 98 char dlerror_buffer[__BIONIC_DLERROR_BUFFER_SIZE]; 99} __attribute__((aligned(16))); // Align it as thread stack top below it should be aligned. 100 101__LIBC_HIDDEN__ int __init_thread(pthread_internal_t* thread, bool add_to_thread_list); 102__LIBC_HIDDEN__ void __init_tls(pthread_internal_t* thread); 103__LIBC_HIDDEN__ void __init_alternate_signal_stack(pthread_internal_t*); 104__LIBC_HIDDEN__ void _pthread_internal_add(pthread_internal_t* thread); 105 106/* Various third-party apps contain a backport of our pthread_rwlock implementation that uses this. */ 107extern "C" __LIBC64_HIDDEN__ pthread_internal_t* __get_thread(void); 108 109__LIBC_HIDDEN__ void pthread_key_clean_all(void); 110__LIBC_HIDDEN__ void _pthread_internal_remove_locked(pthread_internal_t* thread, bool free_thread); 111 112/* 113 * Traditionally we gave threads a 1MiB stack. When we started 114 * allocating per-thread alternate signal stacks to ease debugging of 115 * stack overflows, we subtracted the same amount we were using there 116 * from the default thread stack size. This should keep memory usage 117 * roughly constant. 118 */ 119#define PTHREAD_STACK_SIZE_DEFAULT ((1 * 1024 * 1024) - SIGSTKSZ) 120 121__LIBC_HIDDEN__ extern pthread_internal_t* g_thread_list; 122__LIBC_HIDDEN__ extern pthread_mutex_t g_thread_list_lock; 123 124/* Needed by fork. */ 125__LIBC_HIDDEN__ extern void __bionic_atfork_run_prepare(); 126__LIBC_HIDDEN__ extern void __bionic_atfork_run_child(); 127__LIBC_HIDDEN__ extern void __bionic_atfork_run_parent(); 128 129#endif /* _PTHREAD_INTERNAL_H_ */ 130