pthread_create.cpp revision 98624c374646a050556bdc402b55b792fefa7e55
14b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes/* 24b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * Copyright (C) 2008 The Android Open Source Project 34b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * All rights reserved. 44b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * 54b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * Redistribution and use in source and binary forms, with or without 64b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * modification, are permitted provided that the following conditions 74b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * are met: 84b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * * Redistributions of source code must retain the above copyright 94b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * notice, this list of conditions and the following disclaimer. 104b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * * Redistributions in binary form must reproduce the above copyright 114b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * notice, this list of conditions and the following disclaimer in 124b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * the documentation and/or other materials provided with the 134b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * distribution. 144b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * 154b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 164b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 174b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 184b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 194b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 204b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 214b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 224b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 234b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 244b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 254b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 264b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes * SUCH DAMAGE. 274b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes */ 284b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 294b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#include <pthread.h> 304b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 314b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#include <errno.h> 324b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#include <sys/mman.h> 334b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 344b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#include "pthread_internal.h" 354b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 364b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#include "private/bionic_ssp.h" 374b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#include "private/bionic_tls.h" 388f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes#include "private/libc_logging.h" 394b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#include "private/thread_private.h" 404b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#include "private/ErrnoRestorer.h" 414b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#include "private/ScopedPthreadMutexLocker.h" 424b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 4340eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughesextern "C" int __pthread_clone(void* (*fn)(void*), void* child_stack, int flags, void* arg); 444b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 454b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#ifdef __i386__ 464b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#define ATTRIBUTES __attribute__((noinline)) __attribute__((fastcall)) 474b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#else 484b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#define ATTRIBUTES __attribute__((noinline)) 494b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes#endif 504b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 514b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughesextern "C" void ATTRIBUTES _thread_created_hook(pid_t thread_id); 524b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 532a0b873065edb304fa2d1c54f8de663ea638b8abElliott Hughesextern "C" int __set_tls(void* ptr); 542a0b873065edb304fa2d1c54f8de663ea638b8abElliott Hughes 554b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughesstatic pthread_mutex_t gPthreadStackCreationLock = PTHREAD_MUTEX_INITIALIZER; 564b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 574b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughesstatic pthread_mutex_t gDebuggerNotificationLock = PTHREAD_MUTEX_INITIALIZER; 584b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 5940eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughesvoid __init_tls(pthread_internal_t* thread) { 604b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Zero-initialize all the slots. 614b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes for (size_t i = 0; i < BIONIC_TLS_SLOTS; ++i) { 6240eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes thread->tls[i] = NULL; 634b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 644b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 654b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Slot 0 must point to itself. The x86 Linux kernel reads the TLS from %fs:0. 6640eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes thread->tls[TLS_SLOT_SELF] = thread->tls; 6740eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes thread->tls[TLS_SLOT_THREAD_ID] = thread; 684b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // GCC looks in the TLS for the stack guard on x86, so copy it there from our global. 6940eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes thread->tls[TLS_SLOT_STACK_GUARD] = (void*) __stack_chk_guard; 704b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 7140eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes __set_tls(thread->tls); 7284114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes 7384114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes // Create and set an alternate signal stack. 7484114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes // This must happen after __set_tls, in case a system call fails and tries to set errno. 7584114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes stack_t ss; 7684114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes ss.ss_sp = mmap(NULL, SIGSTKSZ, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0); 7784114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes if (ss.ss_sp != MAP_FAILED) { 7884114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes ss.ss_size = SIGSTKSZ; 7984114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes ss.ss_flags = 0; 8084114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes sigaltstack(&ss, NULL); 8184114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes thread->alternate_signal_stack = ss.ss_sp; 8284114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes } 834b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes} 844b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 854b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes__LIBC_ABI_PRIVATE__ 8640eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughesint _init_thread(pthread_internal_t* thread, bool add_to_thread_list) { 874b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes int error = 0; 884b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 894b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Set the scheduling policy/priority of the thread. 904b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (thread->attr.sched_policy != SCHED_NORMAL) { 914b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes struct sched_param param; 924b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes param.sched_priority = thread->attr.sched_priority; 9340eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes if (sched_setscheduler(thread->tid, thread->attr.sched_policy, ¶m) == -1) { 9498624c374646a050556bdc402b55b792fefa7e55Elliott Hughes#if __LP64__ 9598624c374646a050556bdc402b55b792fefa7e55Elliott Hughes // For backwards compatibility reasons, we only report failures on 64-bit devices. 9698624c374646a050556bdc402b55b792fefa7e55Elliott Hughes error = errno; 9798624c374646a050556bdc402b55b792fefa7e55Elliott Hughes#endif 98b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes __libc_format_log(ANDROID_LOG_WARN, "libc", 99b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes "pthread_create sched_setscheduler call failed: %s", strerror(errno)); 1004b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1014b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1024b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1034b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_cond_init(&thread->join_cond, NULL); 1044b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->cleanup_stack = NULL; 1054b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1064b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (add_to_thread_list) { 1074b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes _pthread_internal_add(thread); 1084b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1094b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1104b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return error; 1114b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes} 1124b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 113b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughesstatic void* __create_thread_stack(pthread_internal_t* thread) { 1144b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes ScopedPthreadMutexLocker lock(&gPthreadStackCreationLock); 1154b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1164b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Create a new private anonymous map. 1174b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes int prot = PROT_READ | PROT_WRITE; 1184b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE; 119b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes void* stack = mmap(NULL, thread->attr.stack_size, prot, flags, -1, 0); 1204b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (stack == MAP_FAILED) { 121b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes __libc_format_log(ANDROID_LOG_WARN, 122b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes "libc", 123b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes "pthread_create failed: couldn't allocate %zd-byte stack: %s", 124b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes thread->attr.stack_size, strerror(errno)); 1254b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return NULL; 1264b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1274b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1284b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Set the guard region at the end of the stack to PROT_NONE. 129b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes if (mprotect(stack, thread->attr.guard_size, PROT_NONE) == -1) { 130b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes __libc_format_log(ANDROID_LOG_WARN, "libc", 131b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes "pthread_create failed: couldn't mprotect PROT_NONE %zd-byte stack guard region: %s", 132b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes thread->attr.guard_size, strerror(errno)); 133b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes munmap(stack, thread->attr.stack_size); 1344b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return NULL; 1354b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1364b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1374b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return stack; 1384b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes} 1394b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1404b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughesint pthread_create(pthread_t* thread_out, pthread_attr_t const* attr, 1414b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes void* (*start_routine)(void*), void* arg) { 1424b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes ErrnoRestorer errno_restorer; 1434b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1444b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Inform the rest of the C library that at least one thread 1454b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // was created. This will enforce certain functions to acquire/release 1464b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // locks (e.g. atexit()) to protect shared global structures. 1474b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // This works because pthread_create() is not called by the C library 1484b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // initialization routine that sets up the main thread's data structures. 1494b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes __isthreaded = 1; 1504b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1514b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_internal_t* thread = reinterpret_cast<pthread_internal_t*>(calloc(sizeof(*thread), 1)); 1524b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (thread == NULL) { 153cfa089df23ff50fcd5ed3854c54991d30be5fc7eElliott Hughes __libc_format_log(ANDROID_LOG_WARN, "libc", "pthread_create failed: couldn't allocate thread"); 1544b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return EAGAIN; 1554b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1564b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->allocated_on_heap = true; 1574b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1584b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (attr == NULL) { 1594b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_attr_init(&thread->attr); 1604b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } else { 1614b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->attr = *attr; 1624b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes attr = NULL; // Prevent misuse below. 1634b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1644b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 165b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes // Make sure the stack size and guard size are multiples of PAGE_SIZE. 166b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes thread->attr.stack_size = (thread->attr.stack_size + (PAGE_SIZE-1)) & ~(PAGE_SIZE-1); 167b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes thread->attr.guard_size = (thread->attr.guard_size + (PAGE_SIZE-1)) & ~(PAGE_SIZE-1); 1684b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1694b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (thread->attr.stack_base == NULL) { 1704b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // The caller didn't provide a stack, so allocate one. 171b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes thread->attr.stack_base = __create_thread_stack(thread); 1724b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (thread->attr.stack_base == NULL) { 1734b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes free(thread); 1744b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return EAGAIN; 1754b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1764b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } else { 1774b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // The caller did provide a stack, so remember we're not supposed to free it. 1784b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->attr.flags |= PTHREAD_ATTR_FLAG_USER_STACK; 1794b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1804b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 18184114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes // Make room for the TLS area. 18284114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes // The child stack is the same address, just growing in the opposite direction. 18384114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes // At offsets >= 0, we have the TLS slots. 18484114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes // At offsets < 0, we have the child stack. 185b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes void** tls = (void**)((uint8_t*)(thread->attr.stack_base) + thread->attr.stack_size - BIONIC_TLS_SLOTS * sizeof(void*)); 18684114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes void* child_stack = tls; 1874b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1884b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Create a mutex for the thread in TLS_SLOT_SELF to wait on once it starts so we can keep 1894b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // it from doing anything until after we notify the debugger about it 1904b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // 1914b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // This also provides the memory barrier we need to ensure that all 1924b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // memory accesses previously performed by this thread are visible to 1934b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // the new thread. 1944b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_mutex_t* start_mutex = (pthread_mutex_t*) &tls[TLS_SLOT_SELF]; 1954b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_mutex_init(start_mutex, NULL); 1964b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes ScopedPthreadMutexLocker start_locker(start_mutex); 1974b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1984b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes tls[TLS_SLOT_THREAD_ID] = thread; 1994b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 20040eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes int flags = CLONE_FILES | CLONE_FS | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD | CLONE_SYSVSEM; 2014b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 20284114c8dd5b17efecf7988f263ce431208d7be5aElliott Hughes int tid = __pthread_clone(start_routine, child_stack, flags, arg); 2034b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (tid < 0) { 2044b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes int clone_errno = errno; 2054b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if ((thread->attr.flags & PTHREAD_ATTR_FLAG_USER_STACK) == 0) { 206b95cf0d23a1db3b7c37bd98b0c86196796c9b029Elliott Hughes munmap(thread->attr.stack_base, thread->attr.stack_size); 2074b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 2084b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes free(thread); 209cfa089df23ff50fcd5ed3854c54991d30be5fc7eElliott Hughes __libc_format_log(ANDROID_LOG_WARN, "libc", "pthread_create failed: clone failed: %s", strerror(errno)); 2104b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return clone_errno; 2114b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 2124b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 21340eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes thread->tid = tid; 21440eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes 21540eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes int init_errno = _init_thread(thread, true); 2164b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (init_errno != 0) { 2174b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Mark the thread detached and let its __thread_entry run to 2184b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // completion. (It'll just exit immediately, cleaning up its resources.) 219eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes thread->internal_flags |= PTHREAD_INTERNAL_FLAG_THREAD_INIT_FAILED; 2204b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->attr.flags |= PTHREAD_ATTR_FLAG_DETACHED; 2214b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return init_errno; 2224b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 2234b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 2244b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Notify any debuggers about the new thread. 2254b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes { 2264b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes ScopedPthreadMutexLocker debugger_locker(&gDebuggerNotificationLock); 22740eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes _thread_created_hook(thread->tid); 2284b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 2294b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 2304b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Publish the pthread_t and let the thread run. 2314b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes *thread_out = (pthread_t) thread; 2324b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 2334b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return 0; 2344b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes} 235