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 /* Has the thread been detached by a pthread_join or pthread_detach call? */ 34 #define PTHREAD_ATTR_FLAG_DETACHED 0x00000001 35 36 /* Was the thread's stack allocated by the user rather than by us? */ 37 #define PTHREAD_ATTR_FLAG_USER_ALLOCATED_STACK 0x00000002 38 39 /* Has the thread been joined by another thread? */ 40 #define PTHREAD_ATTR_FLAG_JOINED 0x00000004 41 42 /* Is this the main thread? */ 43 #define PTHREAD_ATTR_FLAG_MAIN_THREAD 0x80000000 44 45 struct pthread_internal_t { 46 struct pthread_internal_t* next; 47 struct pthread_internal_t* prev; 48 49 pid_t tid; 50 51 private: 52 pid_t cached_pid_; 53 54 public: 55 pid_t invalidate_cached_pid() { 56 pid_t old_value; 57 get_cached_pid(&old_value); 58 set_cached_pid(0); 59 return old_value; 60 } 61 62 void set_cached_pid(pid_t value) { 63 cached_pid_ = value; 64 } 65 66 bool get_cached_pid(pid_t* cached_pid) { 67 *cached_pid = cached_pid_; 68 return (*cached_pid != 0); 69 } 70 71 bool user_allocated_stack() { 72 return (attr.flags & PTHREAD_ATTR_FLAG_USER_ALLOCATED_STACK) != 0; 73 } 74 75 void** tls; 76 77 pthread_attr_t attr; 78 79 __pthread_cleanup_t* cleanup_stack; 80 81 void* (*start_routine)(void*); 82 void* start_routine_arg; 83 void* return_value; 84 85 void* alternate_signal_stack; 86 87 pthread_mutex_t startup_handshake_mutex; 88 89 /* 90 * The dynamic linker implements dlerror(3), which makes it hard for us to implement this 91 * per-thread buffer by simply using malloc(3) and free(3). 92 */ 93 #define __BIONIC_DLERROR_BUFFER_SIZE 512 94 char dlerror_buffer[__BIONIC_DLERROR_BUFFER_SIZE]; 95 }; 96 97 __LIBC_HIDDEN__ int __init_thread(pthread_internal_t* thread, bool add_to_thread_list); 98 __LIBC_HIDDEN__ void __init_tls(pthread_internal_t* thread); 99 __LIBC_HIDDEN__ void __init_alternate_signal_stack(pthread_internal_t*); 100 __LIBC_HIDDEN__ void _pthread_internal_add(pthread_internal_t* thread); 101 102 /* Various third-party apps contain a backport of our pthread_rwlock implementation that uses this. */ 103 extern "C" __LIBC64_HIDDEN__ pthread_internal_t* __get_thread(void); 104 105 __LIBC_HIDDEN__ void pthread_key_clean_all(void); 106 __LIBC_HIDDEN__ void _pthread_internal_remove_locked(pthread_internal_t* thread); 107 108 /* 109 * Traditionally we gave threads a 1MiB stack. When we started 110 * allocating per-thread alternate signal stacks to ease debugging of 111 * stack overflows, we subtracted the same amount we were using there 112 * from the default thread stack size. This should keep memory usage 113 * roughly constant. 114 */ 115 #define PTHREAD_STACK_SIZE_DEFAULT ((1 * 1024 * 1024) - SIGSTKSZ) 116 117 __LIBC_HIDDEN__ extern pthread_internal_t* g_thread_list; 118 __LIBC_HIDDEN__ extern pthread_mutex_t g_thread_list_lock; 119 120 __LIBC_HIDDEN__ int __timespec_from_absolute(timespec*, const timespec*, clockid_t); 121 122 /* Needed by fork. */ 123 __LIBC_HIDDEN__ extern void __bionic_atfork_run_prepare(); 124 __LIBC_HIDDEN__ extern void __bionic_atfork_run_child(); 125 __LIBC_HIDDEN__ extern void __bionic_atfork_run_parent(); 126 127 #endif /* _PTHREAD_INTERNAL_H_ */ 128
