pthread_create.cpp revision cfa089df23ff50fcd5ed3854c54991d30be5fc7e
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 534b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughesstatic const int kPthreadInitFailed = 1; 544b4a8824289c48c823cd38bc63289d121aae3d67Elliott 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); 724b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes} 734b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 744b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes// This trampoline is called from the assembly _pthread_clone() function. 7540eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughesextern "C" void __thread_entry(void* (*func)(void*), void* arg, void** tls) { 764b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Wait for our creating thread to release us. This lets it have time to 774b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // notify gdb about this thread before we start doing anything. 784b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // This also provides the memory barrier needed to ensure that all memory 794b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // accesses previously made by the creating thread are visible to us. 804b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_mutex_t* start_mutex = (pthread_mutex_t*) &tls[TLS_SLOT_SELF]; 814b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_mutex_lock(start_mutex); 824b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_mutex_destroy(start_mutex); 834b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 844b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_internal_t* thread = (pthread_internal_t*) tls[TLS_SLOT_THREAD_ID]; 8540eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes thread->tls = tls; 8640eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes __init_tls(thread); 874b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 884b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if ((thread->internal_flags & kPthreadInitFailed) != 0) { 894b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_exit(NULL); 904b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 914b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 9240eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes void* result = func(arg); 9340eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes pthread_exit(result); 944b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes} 954b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 964b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes__LIBC_ABI_PRIVATE__ 9740eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughesint _init_thread(pthread_internal_t* thread, bool add_to_thread_list) { 984b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes int error = 0; 994b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1004b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Set the scheduling policy/priority of the thread. 1014b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (thread->attr.sched_policy != SCHED_NORMAL) { 1024b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes struct sched_param param; 1034b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes param.sched_priority = thread->attr.sched_priority; 10440eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes if (sched_setscheduler(thread->tid, thread->attr.sched_policy, ¶m) == -1) { 1054b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // For backwards compatibility reasons, we just warn about failures here. 1064b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // error = errno; 1074b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes const char* msg = "pthread_create sched_setscheduler call failed: %s\n"; 1084b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes __libc_format_log(ANDROID_LOG_WARN, "libc", msg, strerror(errno)); 1094b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1104b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1114b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1124b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_cond_init(&thread->join_cond, NULL); 1134b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->join_count = 0; 1144b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->cleanup_stack = NULL; 1154b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1164b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (add_to_thread_list) { 1174b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes _pthread_internal_add(thread); 1184b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1194b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1204b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return error; 1214b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes} 1224b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1234b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughesstatic void* __create_thread_stack(size_t stack_size, size_t guard_size) { 1244b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes ScopedPthreadMutexLocker lock(&gPthreadStackCreationLock); 1254b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1264b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Create a new private anonymous map. 1274b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes int prot = PROT_READ | PROT_WRITE; 1284b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE; 1294b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes void* stack = mmap(NULL, stack_size, prot, flags, -1, 0); 1304b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (stack == MAP_FAILED) { 1314b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return NULL; 1324b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1334b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1344b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Set the guard region at the end of the stack to PROT_NONE. 1354b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (mprotect(stack, guard_size, PROT_NONE) == -1) { 1364b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes munmap(stack, stack_size); 1374b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return NULL; 1384b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1394b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1404b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return stack; 1414b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes} 1424b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1434b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughesint pthread_create(pthread_t* thread_out, pthread_attr_t const* attr, 1444b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes void* (*start_routine)(void*), void* arg) { 1454b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes ErrnoRestorer errno_restorer; 1464b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1474b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Inform the rest of the C library that at least one thread 1484b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // was created. This will enforce certain functions to acquire/release 1494b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // locks (e.g. atexit()) to protect shared global structures. 1504b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // This works because pthread_create() is not called by the C library 1514b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // initialization routine that sets up the main thread's data structures. 1524b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes __isthreaded = 1; 1534b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1544b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_internal_t* thread = reinterpret_cast<pthread_internal_t*>(calloc(sizeof(*thread), 1)); 1554b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (thread == NULL) { 156cfa089df23ff50fcd5ed3854c54991d30be5fc7eElliott Hughes __libc_format_log(ANDROID_LOG_WARN, "libc", "pthread_create failed: couldn't allocate thread"); 1574b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return EAGAIN; 1584b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1594b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->allocated_on_heap = true; 1604b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1614b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (attr == NULL) { 1624b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_attr_init(&thread->attr); 1634b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } else { 1644b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->attr = *attr; 1654b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes attr = NULL; // Prevent misuse below. 1664b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1674b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1684b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Make sure the stack size is PAGE_SIZE aligned. 1694b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes size_t stack_size = (thread->attr.stack_size + (PAGE_SIZE-1)) & ~(PAGE_SIZE-1); 1704b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1714b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (thread->attr.stack_base == NULL) { 1724b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // The caller didn't provide a stack, so allocate one. 1734b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->attr.stack_base = __create_thread_stack(stack_size, thread->attr.guard_size); 1744b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (thread->attr.stack_base == NULL) { 1754b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes free(thread); 176cfa089df23ff50fcd5ed3854c54991d30be5fc7eElliott Hughes __libc_format_log(ANDROID_LOG_WARN, "libc", "pthread_create failed: couldn't allocate %zd-byte stack", stack_size); 1774b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return EAGAIN; 1784b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1794b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } else { 1804b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // The caller did provide a stack, so remember we're not supposed to free it. 1814b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->attr.flags |= PTHREAD_ATTR_FLAG_USER_STACK; 1824b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 1834b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1844b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Make room for TLS. 1854b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes void** tls = (void**)((uint8_t*)(thread->attr.stack_base) + stack_size - BIONIC_TLS_SLOTS * sizeof(void*)); 1864b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1874b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Create a mutex for the thread in TLS_SLOT_SELF to wait on once it starts so we can keep 1884b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // it from doing anything until after we notify the debugger about it 1894b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // 1904b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // This also provides the memory barrier we need to ensure that all 1914b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // memory accesses previously performed by this thread are visible to 1924b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // the new thread. 1934b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_mutex_t* start_mutex = (pthread_mutex_t*) &tls[TLS_SLOT_SELF]; 1944b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes pthread_mutex_init(start_mutex, NULL); 1954b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes ScopedPthreadMutexLocker start_locker(start_mutex); 1964b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 1974b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes tls[TLS_SLOT_THREAD_ID] = thread; 1984b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 19940eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes int flags = CLONE_FILES | CLONE_FS | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD | CLONE_SYSVSEM; 2004b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 20140eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes int tid = __pthread_clone(start_routine, tls, flags, arg); 2024b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (tid < 0) { 2034b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes int clone_errno = errno; 2044b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if ((thread->attr.flags & PTHREAD_ATTR_FLAG_USER_STACK) == 0) { 2054b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes munmap(thread->attr.stack_base, stack_size); 2064b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 2074b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes free(thread); 208cfa089df23ff50fcd5ed3854c54991d30be5fc7eElliott Hughes __libc_format_log(ANDROID_LOG_WARN, "libc", "pthread_create failed: clone failed: %s", strerror(errno)); 2094b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return clone_errno; 2104b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 2114b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 21240eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes thread->tid = tid; 21340eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes 21440eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes int init_errno = _init_thread(thread, true); 2154b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes if (init_errno != 0) { 2164b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Mark the thread detached and let its __thread_entry run to 2174b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // completion. (It'll just exit immediately, cleaning up its resources.) 2184b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->internal_flags |= kPthreadInitFailed; 2194b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes thread->attr.flags |= PTHREAD_ATTR_FLAG_DETACHED; 2204b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return init_errno; 2214b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 2224b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 2234b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Notify any debuggers about the new thread. 2244b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes { 2254b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes ScopedPthreadMutexLocker debugger_locker(&gDebuggerNotificationLock); 22640eabe24e4e3ae8ebe437f1f4e43cf39cbba2e9eElliott Hughes _thread_created_hook(thread->tid); 2274b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes } 2284b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 2294b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes // Publish the pthread_t and let the thread run. 2304b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes *thread_out = (pthread_t) thread; 2314b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes 2324b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes return 0; 2334b4a8824289c48c823cd38bc63289d121aae3d67Elliott Hughes} 234