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 #include <stdatomic.h> 33 34 #include "private/bionic_lock.h" 35 #include "private/bionic_tls.h" 36 37 /* Has the thread been detached by a pthread_join or pthread_detach call? */ 38 #define PTHREAD_ATTR_FLAG_DETACHED 0x00000001 39 40 /* Has the thread been joined by another thread? */ 41 #define PTHREAD_ATTR_FLAG_JOINED 0x00000002 42 43 class pthread_key_data_t { 44 public: 45 uintptr_t seq; // Use uintptr_t just for alignment, as we use pointer below. 46 void* data; 47 }; 48 49 enum ThreadJoinState { 50 THREAD_NOT_JOINED, 51 THREAD_EXITED_NOT_JOINED, 52 THREAD_JOINED, 53 THREAD_DETACHED 54 }; 55 56 class thread_local_dtor; 57 58 class pthread_internal_t { 59 public: 60 class pthread_internal_t* next; 61 class pthread_internal_t* prev; 62 63 pid_t tid; 64 65 private: 66 pid_t cached_pid_; 67 68 public: 69 pid_t invalidate_cached_pid() { 70 pid_t old_value; 71 get_cached_pid(&old_value); 72 set_cached_pid(0); 73 return old_value; 74 } 75 76 void set_cached_pid(pid_t value) { 77 cached_pid_ = value; 78 } 79 80 bool get_cached_pid(pid_t* cached_pid) { 81 *cached_pid = cached_pid_; 82 return (*cached_pid != 0); 83 } 84 85 pthread_attr_t attr; 86 87 _Atomic(ThreadJoinState) join_state; 88 89 __pthread_cleanup_t* cleanup_stack; 90 91 void* (*start_routine)(void*); 92 void* start_routine_arg; 93 void* return_value; 94 95 void* alternate_signal_stack; 96 97 Lock startup_handshake_lock; 98 99 size_t mmap_size; 100 101 thread_local_dtor* thread_local_dtors; 102 103 void* tls[BIONIC_TLS_SLOTS]; 104 105 pthread_key_data_t key_data[BIONIC_PTHREAD_KEY_COUNT]; 106 107 /* 108 * The dynamic linker implements dlerror(3), which makes it hard for us to implement this 109 * per-thread buffer by simply using malloc(3) and free(3). 110 */ 111 #define __BIONIC_DLERROR_BUFFER_SIZE 512 112 char dlerror_buffer[__BIONIC_DLERROR_BUFFER_SIZE]; 113 }; 114 115 __LIBC_HIDDEN__ int __init_thread(pthread_internal_t* thread); 116 __LIBC_HIDDEN__ void __init_tls(pthread_internal_t* thread); 117 __LIBC_HIDDEN__ void __init_alternate_signal_stack(pthread_internal_t*); 118 119 __LIBC_HIDDEN__ pthread_t __pthread_internal_add(pthread_internal_t* thread); 120 __LIBC_HIDDEN__ pthread_internal_t* __pthread_internal_find(pthread_t pthread_id); 121 __LIBC_HIDDEN__ void __pthread_internal_remove(pthread_internal_t* thread); 122 __LIBC_HIDDEN__ void __pthread_internal_remove_and_free(pthread_internal_t* thread); 123 124 // Make __get_thread() inlined for performance reason. See http://b/19825434. 125 static inline __always_inline pthread_internal_t* __get_thread() { 126 return reinterpret_cast<pthread_internal_t*>(__get_tls()[TLS_SLOT_THREAD_ID]); 127 } 128 129 __LIBC_HIDDEN__ void pthread_key_clean_all(void); 130 131 /* 132 * Traditionally we gave threads a 1MiB stack. When we started 133 * allocating per-thread alternate signal stacks to ease debugging of 134 * stack overflows, we subtracted the same amount we were using there 135 * from the default thread stack size. This should keep memory usage 136 * roughly constant. 137 */ 138 #define PTHREAD_STACK_SIZE_DEFAULT ((1 * 1024 * 1024) - SIGSTKSZ) 139 140 // Leave room for a guard page in the internally created signal stacks. 141 #if defined(__LP64__) 142 // SIGSTKSZ is not big enough for 64-bit arch. See http://b/23041777. 143 #define SIGNAL_STACK_SIZE (16 * 1024 + PAGE_SIZE) 144 #else 145 #define SIGNAL_STACK_SIZE (SIGSTKSZ + PAGE_SIZE) 146 #endif 147 148 /* Needed by fork. */ 149 __LIBC_HIDDEN__ extern void __bionic_atfork_run_prepare(); 150 __LIBC_HIDDEN__ extern void __bionic_atfork_run_child(); 151 __LIBC_HIDDEN__ extern void __bionic_atfork_run_parent(); 152 153 #endif /* _PTHREAD_INTERNAL_H_ */ 154
