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Merge "More pthreads cleanup."

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This commit is contained in:
Elliott Hughes 2013-02-12 02:33:07 +00:00 committed by Gerrit Code Review
commit 85f491f96d
17 changed files with 363 additions and 292 deletions
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2
libc/Android.mk
View File

@ -279,6 +279,8 @@ libc_bionic_src_files := \
bionic/__memcpy_chk.cpp \
bionic/__memmove_chk.cpp \
bionic/__memset_chk.cpp \
bionic/pthread_attr.cpp \
bionic/pthread_setname_np.cpp \
bionic/pthread_sigmask.cpp \
bionic/raise.cpp \
bionic/sbrk.cpp \

6
libc/bionic/dirent.cpp
View File

@ -36,7 +36,8 @@
#include <sys/types.h>
#include <unistd.h>
#include <private/ScopedPthreadMutexLocker.h>
#include "private/ErrnoRestorer.h"
#include "private/ScopedPthreadMutexLocker.h"
struct DIR {
int fd_;
@ -108,7 +109,7 @@ dirent* readdir(DIR* d) {
}
int readdir_r(DIR* d, dirent* entry, dirent** result) {
int saved_errno = errno;
ErrnoRestorer errno_restorer;
*result = NULL;
errno = 0;
@ -124,7 +125,6 @@ int readdir_r(DIR* d, dirent* entry, dirent** result) {
memcpy(entry, next, next->d_reclen);
*result = entry;
}
errno = saved_errno;
return 0;
}

233
libc/bionic/pthread.c
View File

@ -26,23 +26,12 @@
* SUCH DAMAGE.
*/
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <malloc.h>
#include <memory.h>
#include <pthread.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <sys/atomics.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include "bionic_atomic_inline.h"
@ -84,23 +73,8 @@ void ATTRIBUTES _thread_created_hook(pid_t thread_id);
static const int kPthreadInitFailed = 1;
#define PTHREAD_ATTR_FLAG_DETACHED 0x00000001
#define PTHREAD_ATTR_FLAG_USER_STACK 0x00000002
#define DEFAULT_STACKSIZE (1024 * 1024)
static pthread_mutex_t mmap_lock = PTHREAD_MUTEX_INITIALIZER;
static const pthread_attr_t gDefaultPthreadAttr = {
.flags = 0,
.stack_base = NULL,
.stack_size = DEFAULT_STACKSIZE,
.guard_size = PAGE_SIZE,
.sched_policy = SCHED_NORMAL,
.sched_priority = 0
};
__LIBC_HIDDEN__ pthread_internal_t* gThreadList = NULL;
__LIBC_HIDDEN__ pthread_mutex_t gThreadListLock = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t gDebuggerNotificationLock = PTHREAD_MUTEX_INITIALIZER;
@ -306,7 +280,7 @@ int pthread_create(pthread_t *thread_out, pthread_attr_t const * attr,
pthread_internal_t* thread = calloc(sizeof(*thread), 1);
if (thread == NULL) {
return ENOMEM;
return EAGAIN;
}
thread->allocated_on_heap = true;
@ -321,7 +295,7 @@ int pthread_create(pthread_t *thread_out, pthread_attr_t const * attr,
stack = mkstack(stack_size, attr->guard_size);
if (stack == NULL) {
free(thread);
return ENOMEM;
return EAGAIN;
}
}
@ -379,152 +353,6 @@ int pthread_create(pthread_t *thread_out, pthread_attr_t const * attr,
}
int pthread_attr_init(pthread_attr_t * attr)
{
*attr = gDefaultPthreadAttr;
return 0;
}
int pthread_attr_destroy(pthread_attr_t * attr)
{
memset(attr, 0x42, sizeof(pthread_attr_t));
return 0;
}
int pthread_attr_setdetachstate(pthread_attr_t * attr, int state)
{
if (state == PTHREAD_CREATE_DETACHED) {
attr->flags |= PTHREAD_ATTR_FLAG_DETACHED;
} else if (state == PTHREAD_CREATE_JOINABLE) {
attr->flags &= ~PTHREAD_ATTR_FLAG_DETACHED;
} else {
return EINVAL;
}
return 0;
}
int pthread_attr_getdetachstate(pthread_attr_t const * attr, int * state)
{
*state = (attr->flags & PTHREAD_ATTR_FLAG_DETACHED)
? PTHREAD_CREATE_DETACHED
: PTHREAD_CREATE_JOINABLE;
return 0;
}
int pthread_attr_setschedpolicy(pthread_attr_t * attr, int policy)
{
attr->sched_policy = policy;
return 0;
}
int pthread_attr_getschedpolicy(pthread_attr_t const * attr, int * policy)
{
*policy = attr->sched_policy;
return 0;
}
int pthread_attr_setschedparam(pthread_attr_t * attr, struct sched_param const * param)
{
attr->sched_priority = param->sched_priority;
return 0;
}
int pthread_attr_getschedparam(pthread_attr_t const * attr, struct sched_param * param)
{
param->sched_priority = attr->sched_priority;
return 0;
}
int pthread_attr_setstacksize(pthread_attr_t * attr, size_t stack_size)
{
if ((stack_size & (PAGE_SIZE - 1) || stack_size < PTHREAD_STACK_MIN)) {
return EINVAL;
}
attr->stack_size = stack_size;
return 0;
}
int pthread_attr_getstacksize(pthread_attr_t const * attr, size_t * stack_size)
{
*stack_size = attr->stack_size;
return 0;
}
int pthread_attr_setstackaddr(pthread_attr_t * attr __attribute__((unused)),
void * stack_addr __attribute__((unused)))
{
// This was removed from POSIX.1-2008, and is not implemented on bionic.
// Needed for ABI compatibility with the NDK.
return ENOSYS;
}
int pthread_attr_getstackaddr(pthread_attr_t const * attr, void ** stack_addr)
{
// This was removed from POSIX.1-2008.
// Needed for ABI compatibility with the NDK.
*stack_addr = (char*)attr->stack_base + attr->stack_size;
return 0;
}
int pthread_attr_setstack(pthread_attr_t * attr, void * stack_base, size_t stack_size)
{
if ((stack_size & (PAGE_SIZE - 1) || stack_size < PTHREAD_STACK_MIN)) {
return EINVAL;
}
if ((uint32_t)stack_base & (PAGE_SIZE - 1)) {
return EINVAL;
}
attr->stack_base = stack_base;
attr->stack_size = stack_size;
return 0;
}
int pthread_attr_getstack(pthread_attr_t const * attr, void ** stack_base, size_t * stack_size)
{
*stack_base = attr->stack_base;
*stack_size = attr->stack_size;
return 0;
}
int pthread_attr_setguardsize(pthread_attr_t * attr, size_t guard_size)
{
if (guard_size & (PAGE_SIZE - 1) || guard_size < PAGE_SIZE) {
return EINVAL;
}
attr->guard_size = guard_size;
return 0;
}
int pthread_attr_getguardsize(pthread_attr_t const * attr, size_t * guard_size)
{
*guard_size = attr->guard_size;
return 0;
}
int pthread_getattr_np(pthread_t thid, pthread_attr_t * attr)
{
pthread_internal_t * thread = (pthread_internal_t *)thid;
*attr = thread->attr;
return 0;
}
int pthread_attr_setscope(pthread_attr_t *attr __attribute__((unused)), int scope)
{
if (scope == PTHREAD_SCOPE_SYSTEM)
return 0;
if (scope == PTHREAD_SCOPE_PROCESS)
return ENOTSUP;
return EINVAL;
}
int pthread_attr_getscope(pthread_attr_t const *attr __attribute__((unused)))
{
return PTHREAD_SCOPE_SYSTEM;
}
/* CAVEAT: our implementation of pthread_cleanup_push/pop doesn't support C++ exceptions
* and thread cancelation
*/
@ -1881,57 +1709,6 @@ int pthread_once( pthread_once_t* once_control, void (*init_routine)(void) )
return 0;
}
/* This value is not exported by kernel headers, so hardcode it here */
#define MAX_TASK_COMM_LEN 16
#define TASK_COMM_FMT "/proc/self/task/%u/comm"
int pthread_setname_np(pthread_t thid, const char *thname)
{
size_t thname_len;
int saved_errno, ret;
if (thid == 0 || thname == NULL)
return EINVAL;
thname_len = strlen(thname);
if (thname_len >= MAX_TASK_COMM_LEN)
return ERANGE;
saved_errno = errno;
if (thid == pthread_self())
{
ret = prctl(PR_SET_NAME, (unsigned long)thname, 0, 0, 0) ? errno : 0;
}
else
{
/* Have to change another thread's name */
pthread_internal_t *thread = (pthread_internal_t *)thid;
char comm_name[sizeof(TASK_COMM_FMT) + 8];
ssize_t n;
int fd;
snprintf(comm_name, sizeof(comm_name), TASK_COMM_FMT, (unsigned int)thread->kernel_id);
fd = open(comm_name, O_RDWR);
if (fd == -1)
{
ret = errno;
goto exit;
}
n = TEMP_FAILURE_RETRY(write(fd, thname, thname_len));
close(fd);
if (n < 0)
ret = errno;
else if ((size_t)n != thname_len)
ret = EIO;
else
ret = 0;
}
exit:
errno = saved_errno;
return ret;
}
/* Return the kernel thread ID for a pthread.
* This is only defined for implementations where pthread <-> kernel is 1:1, which this is.
* Not the same as pthread_getthreadid_np, which is commonly defined to be opaque.

165
libc/bionic/pthread_attr.cpp Normal file
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@ -0,0 +1,165 @@
/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <pthread.h>
#include "pthread_internal.h"
#define DEFAULT_STACKSIZE (1024 * 1024)
const pthread_attr_t gDefaultPthreadAttr = {
.flags = 0,
.stack_base = NULL,
.stack_size = DEFAULT_STACKSIZE,
.guard_size = PAGE_SIZE,
.sched_policy = SCHED_NORMAL,
.sched_priority = 0
};
int pthread_attr_init(pthread_attr_t* attr) {
*attr = gDefaultPthreadAttr;
return 0;
}
int pthread_attr_destroy(pthread_attr_t* attr) {
memset(attr, 0x42, sizeof(pthread_attr_t));
return 0;
}
int pthread_attr_setdetachstate(pthread_attr_t* attr, int state) {
if (state == PTHREAD_CREATE_DETACHED) {
attr->flags |= PTHREAD_ATTR_FLAG_DETACHED;
} else if (state == PTHREAD_CREATE_JOINABLE) {
attr->flags &= ~PTHREAD_ATTR_FLAG_DETACHED;
} else {
return EINVAL;
}
return 0;
}
int pthread_attr_getdetachstate(pthread_attr_t const* attr, int* state) {
*state = (attr->flags & PTHREAD_ATTR_FLAG_DETACHED) ? PTHREAD_CREATE_DETACHED : PTHREAD_CREATE_JOINABLE;
return 0;
}
int pthread_attr_setschedpolicy(pthread_attr_t* attr, int policy) {
attr->sched_policy = policy;
return 0;
}
int pthread_attr_getschedpolicy(pthread_attr_t const* attr, int* policy) {
*policy = attr->sched_policy;
return 0;
}
int pthread_attr_setschedparam(pthread_attr_t * attr, struct sched_param const* param) {
attr->sched_priority = param->sched_priority;
return 0;
}
int pthread_attr_getschedparam(pthread_attr_t const* attr, struct sched_param* param) {
param->sched_priority = attr->sched_priority;
return 0;
}
int pthread_attr_setstacksize(pthread_attr_t* attr, size_t stack_size) {
if ((stack_size & (PAGE_SIZE - 1) || stack_size < PTHREAD_STACK_MIN)) {
return EINVAL;
}
attr->stack_size = stack_size;
return 0;
}
int pthread_attr_getstacksize(pthread_attr_t const* attr, size_t* stack_size) {
*stack_size = attr->stack_size;
return 0;
}
int pthread_attr_setstackaddr(pthread_attr_t*, void*) {
// This was removed from POSIX.1-2008, and is not implemented on bionic.
// Needed for ABI compatibility with the NDK.
return ENOSYS;
}
int pthread_attr_getstackaddr(pthread_attr_t const* attr, void** stack_addr) {
// This was removed from POSIX.1-2008.
// Needed for ABI compatibility with the NDK.
*stack_addr = (char*)attr->stack_base + attr->stack_size;
return 0;
}
int pthread_attr_setstack(pthread_attr_t* attr, void* stack_base, size_t stack_size) {
if ((stack_size & (PAGE_SIZE - 1) || stack_size < PTHREAD_STACK_MIN)) {
return EINVAL;
}
if ((uint32_t)stack_base & (PAGE_SIZE - 1)) {
return EINVAL;
}
attr->stack_base = stack_base;
attr->stack_size = stack_size;
return 0;
}
int pthread_attr_getstack(pthread_attr_t const* attr, void** stack_base, size_t* stack_size) {
*stack_base = attr->stack_base;
*stack_size = attr->stack_size;
return 0;
}
int pthread_attr_setguardsize(pthread_attr_t* attr, size_t guard_size) {
if (guard_size & (PAGE_SIZE - 1) || guard_size < PAGE_SIZE) {
return EINVAL;
}
attr->guard_size = guard_size;
return 0;
}
int pthread_attr_getguardsize(pthread_attr_t const* attr, size_t* guard_size) {
*guard_size = attr->guard_size;
return 0;
}
int pthread_getattr_np(pthread_t thid, pthread_attr_t* attr) {
pthread_internal_t* thread = (pthread_internal_t*) thid;
*attr = thread->attr;
return 0;
}
int pthread_attr_setscope(pthread_attr_t* , int scope) {
if (scope == PTHREAD_SCOPE_SYSTEM) {
return 0;
}
if (scope == PTHREAD_SCOPE_PROCESS) {
return ENOTSUP;
}
return EINVAL;
}
int pthread_attr_getscope(pthread_attr_t const*) {
return PTHREAD_SCOPE_SYSTEM;
}

4
libc/bionic/pthread_internal.h
View File

@ -62,6 +62,10 @@ pthread_internal_t* __get_thread(void);
__LIBC_HIDDEN__ void pthread_key_clean_all(void);
#define PTHREAD_ATTR_FLAG_DETACHED 0x00000001
#define PTHREAD_ATTR_FLAG_USER_STACK 0x00000002
extern __LIBC_HIDDEN__ const pthread_attr_t gDefaultPthreadAttr;
extern pthread_internal_t* gThreadList;
extern pthread_mutex_t gThreadListLock;

23
libc/bionic/pthread_key.cpp
View File

@ -26,33 +26,10 @@
* SUCH DAMAGE.
*/
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <malloc.h>
#include <memory.h>
#include <pthread.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/atomics.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include "bionic_atomic_inline.h"
#include "bionic_futex.h"
#include "bionic_pthread.h"
#include "bionic_ssp.h"
#include "bionic_tls.h"
#include "debug_format.h"
#include "pthread_internal.h"
#include "thread_private.h"
/* A technical note regarding our thread-local-storage (TLS) implementation:
*

79
libc/bionic/pthread_setname_np.cpp Normal file
View File

@ -0,0 +1,79 @@
/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <pthread.h>
#include <fcntl.h>
#include <stdio.h> // For snprintf.
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "pthread_internal.h"
#include "private/ErrnoRestorer.h"
// This value is not exported by kernel headers.
#define MAX_TASK_COMM_LEN 16
#define TASK_COMM_FMT "/proc/self/task/%u/comm"
int pthread_setname_np(pthread_t thread, const char* thread_name) {
ErrnoRestorer errno_restorer;
if (thread == 0 || thread_name == NULL) {
return EINVAL;
}
size_t thread_name_len = strlen(thread_name);
if (thread_name_len >= MAX_TASK_COMM_LEN) {
return ERANGE;
}
// Changing our own name is an easy special case.
if (thread == pthread_self()) {
return prctl(PR_SET_NAME, (unsigned long)thread_name, 0, 0, 0) ? errno : 0;
}
// Have to change another thread's name.
pthread_internal_t* t = reinterpret_cast<pthread_internal_t*>(thread);
char comm_name[sizeof(TASK_COMM_FMT) + 8];
snprintf(comm_name, sizeof(comm_name), TASK_COMM_FMT, (unsigned int) t->kernel_id);
int fd = open(comm_name, O_RDWR);
if (fd == -1) {
return errno;
}
ssize_t n = TEMP_FAILURE_RETRY(write(fd, thread_name, thread_name_len));
close(fd);
if (n < 0) {
return errno;
} else if ((size_t)n != thread_name_len) {
return EIO;
}
return 0;
}

13
libc/bionic/pthread_sigmask.cpp
View File

@ -30,12 +30,13 @@
#include <pthread.h>
#include <signal.h>
#include <private/kernel_sigset_t.h>
#include "private/ErrnoRestorer.h"
#include "private/kernel_sigset_t.h"
extern "C" int __rt_sigprocmask(int, const kernel_sigset_t*, kernel_sigset_t*, size_t);
int pthread_sigmask(int how, const sigset_t* iset, sigset_t* oset) {
int old_errno = errno;
ErrnoRestorer errno_restorer;
// 'in_set_ptr' is the second parameter to __rt_sigprocmask. It must be NULL
// if 'set' is NULL to ensure correct semantics (which in this case would
@ -48,15 +49,13 @@ int pthread_sigmask(int how, const sigset_t* iset, sigset_t* oset) {
}
kernel_sigset_t out_set;
int result = __rt_sigprocmask(how, in_set_ptr, &out_set, sizeof(out_set));
if (result < 0) {
result = errno;
if (__rt_sigprocmask(how, in_set_ptr, &out_set, sizeof(out_set)) == -1) {
return errno;
}
if (oset != NULL) {
*oset = out_set.bionic;
}
errno = old_errno;
return result;
return 0;
}

7
libc/bionic/strerror_r.cpp
View File

@ -7,6 +7,8 @@
#include <stdio.h>
#include <string.h>
#include "private/ErrnoRestorer.h"
struct Pair {
int code;
const char* msg;
@ -42,7 +44,7 @@ extern "C" __LIBC_HIDDEN__ const char* __strsignal_lookup(int signal_number) {
}
int strerror_r(int error_number, char* buf, size_t buf_len) {
int saved_errno = errno;
ErrnoRestorer errno_restorer;
size_t length;
const char* error_name = __strerror_lookup(error_number);
@ -52,11 +54,10 @@ int strerror_r(int error_number, char* buf, size_t buf_len) {
length = snprintf(buf, buf_len, "Unknown error %d", error_number);
}
if (length >= buf_len) {
errno = ERANGE;
errno_restorer.override(ERANGE);
return -1;
}
errno = saved_errno;
return 0;
}

19
libc/bionic/stubs.cpp
View File

@ -31,15 +31,17 @@
#include <grp.h>
#include <mntent.h>
#include <netdb.h>
#include <private/android_filesystem_config.h>
#include <private/debug_format.h>
#include <private/logd.h>
#include <pthread.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "private/android_filesystem_config.h"
#include "private/debug_format.h"
#include "private/ErrnoRestorer.h"
#include "private/logd.h"
// Thread-specific state for the non-reentrant functions.
static pthread_once_t stubs_once = PTHREAD_ONCE_INIT;
static pthread_key_t stubs_key;
@ -58,7 +60,7 @@ static int do_getpw_r(int by_name, const char* name, uid_t uid,
passwd** result) {
// getpwnam_r and getpwuid_r don't modify errno, but library calls we
// make might.
int old_errno = errno;
ErrnoRestorer errno_restorer;
*result = NULL;
// Our implementation of getpwnam(3) and getpwuid(3) use thread-local
@ -69,9 +71,7 @@ static int do_getpw_r(int by_name, const char* name, uid_t uid,
// POSIX allows failure to find a match to be considered a non-error.
// Reporting success (0) but with *result NULL is glibc's behavior.
if (src == NULL) {
int rc = (errno == ENOENT) ? 0 : errno;
errno = old_errno;
return rc;
return (errno == ENOENT) ? 0 : errno;
}
// Work out where our strings will go in 'buf', and whether we've got
@ -84,13 +84,11 @@ static int do_getpw_r(int by_name, const char* name, uid_t uid,
dst->pw_shell = buf + required_byte_count;
required_byte_count += strlen(src->pw_shell) + 1;
if (byte_count < required_byte_count) {
errno = old_errno;
return ERANGE;
}
// Copy the strings.
snprintf(buf, byte_count, "%s%c%s%c%s",
src->pw_name, 0, src->pw_dir, 0, src->pw_shell);
snprintf(buf, byte_count, "%s%c%s%c%s", src->pw_name, 0, src->pw_dir, 0, src->pw_shell);
// pw_passwd is non-POSIX and unused (always NULL) in bionic.
// pw_gecos is non-POSIX and missing in bionic.
@ -101,7 +99,6 @@ static int do_getpw_r(int by_name, const char* name, uid_t uid,
dst->pw_uid = src->pw_uid;
*result = dst;
errno = old_errno;
return 0;
}

2
libc/bionic/sysconf.cpp
View File

@ -306,7 +306,7 @@ int sysconf(int name) {
return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
case _SC_THREAD_KEYS_MAX:
return (BIONIC_TLS_SLOTS - TLS_SLOT_FIRST_USER_SLOT);
return (BIONIC_TLS_SLOTS - TLS_SLOT_FIRST_USER_SLOT - GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT);
case _SC_THREAD_STACK_MIN: return SYSTEM_THREAD_STACK_MIN;
case _SC_THREAD_THREADS_MAX: return SYSTEM_THREAD_THREADS_MAX;

8
libc/bionic/tmpfile.cpp
View File

@ -38,6 +38,8 @@
#include <sys/types.h>
#include <unistd.h>
#include "private/ErrnoRestorer.h"
class ScopedSignalBlocker {
public:
ScopedSignalBlocker() {
@ -77,9 +79,8 @@ static FILE* __tmpfile_dir(const char* tmp_dir) {
struct stat sb;
int rc = fstat(fd, &sb);
if (rc == -1) {
int old_errno = errno;
ErrnoRestorer errno_restorer;
close(fd);
errno = old_errno;
return NULL;
}
}
@ -91,9 +92,8 @@ static FILE* __tmpfile_dir(const char* tmp_dir) {
}
// Failure. Clean up. We already unlinked, so we just need to close.
int old_errno = errno;
ErrnoRestorer errno_restorer;
close(fd);
errno = old_errno;
return NULL;
}

43
libc/private/ErrnoRestorer.h Normal file
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@ -0,0 +1,43 @@
/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ERRNO_RESTORER_H
#define ERRNO_RESTORER_H
#include <errno.h>
class ErrnoRestorer {
public:
explicit ErrnoRestorer() : saved_errno_(errno) {
}
~ErrnoRestorer() {
errno = saved_errno_;
}
void override(int new_errno) {
saved_errno_ = new_errno;
}
private:
int saved_errno_;
// Disallow copy and assignment.
ErrnoRestorer(const ErrnoRestorer&);
void operator=(const ErrnoRestorer&);
};
#endif // ERRNO_RESTORER_H

5
libc/private/ThreadLocalBuffer.h
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@ -37,18 +37,17 @@
// TODO: move __cxa_guard_acquire and __cxa_guard_release into libc.
#define GLOBAL_INIT_THREAD_LOCAL_BUFFER(name) \
static pthread_once_t __bionic_tls_ ## name ## _once; \
static pthread_key_t __bionic_tls_ ## name ## _key; \
static void __bionic_tls_ ## name ## _key_destroy(void* buffer) { \
free(buffer); \
} \
static void __bionic_tls_ ## name ## _key_init() { \
/* Run automatically when libc.so is opened by the dynamic linker. */ \
__attribute__((constructor)) static void __bionic_tls_ ## name ## _key_init() { \
pthread_key_create(&__bionic_tls_ ## name ## _key, __bionic_tls_ ## name ## _key_destroy); \
}
// Leaves "name_tls_buffer" and "name_tls_buffer_size" defined and initialized.
#define LOCAL_INIT_THREAD_LOCAL_BUFFER(type, name, byte_count) \
pthread_once(&__bionic_tls_ ## name ## _once, __bionic_tls_ ## name ## _key_init); \
type name ## _tls_buffer = \
reinterpret_cast<type>(pthread_getspecific(__bionic_tls_ ## name ## _key)); \
if (name ## _tls_buffer == NULL) { \

4
libc/private/bionic_futex.h
View File

@ -30,6 +30,8 @@
#include <linux/futex.h>
__BEGIN_DECLS
extern int __futex_wait(volatile void *ftx, int val, const struct timespec *timeout);
extern int __futex_wake(volatile void *ftx, int count);
@ -54,4 +56,6 @@ extern int __futex_syscall4(volatile void *ftx, int op, int val, const struct ti
extern int __futex_wake_ex(volatile void *ftx, int pshared, int val);
extern int __futex_wait_ex(volatile void *ftx, int pshared, int val, const struct timespec *timeout);
__END_DECLS
#endif /* _BIONIC_FUTEX_H */

28
libc/private/bionic_tls.h
View File

@ -43,28 +43,40 @@ __BEGIN_DECLS
** pre-allocated slot directly for performance reason).
**/
/* Maximum number of elements in the TLS array. */
#define BIONIC_TLS_SLOTS 64
/* Well-known TLS slots. What data goes in which slot is arbitrary unless otherwise noted. */
enum {
TLS_SLOT_SELF = 0, /* The kernel requires this specific slot for x86. */
TLS_SLOT_THREAD_ID,
TLS_SLOT_ERRNO,
/* These two aren't used by bionic itself, but allow the graphics code to
* access TLS directly rather than using the pthread API. */
TLS_SLOT_OPENGL_API = 3,
TLS_SLOT_OPENGL = 4,
/* This slot is only used to pass information from the dynamic linker to
* libc.so when the C library is loaded in to memory. The C runtime init
* function will then clear it. Since its use is extremely temporary,
* we reuse an existing location that isn't needed during libc startup. */
TLS_SLOT_BIONIC_PREINIT = TLS_SLOT_OPENGL_API,
TLS_SLOT_STACK_GUARD = 5, /* GCC requires this specific slot for x86. */
TLS_SLOT_DLERROR,
TLS_SLOT_FIRST_USER_SLOT /* Must come last! */
};
/* This slot is only used to pass information from the dynamic linker to
* libc.so when the C library is loaded in to memory. The C runtime init
* function will then clear it. Since its use is extremely temporary,
* we reuse an existing location that isn't needed during libc startup.
/*
* Maximum number of elements in the TLS array.
* POSIX says this must be at least 128, but Android has traditionally had only 64, minus those
* ones used internally by bionic itself.
* There are two kinds of slot used internally by bionic --- there are the well-known slots
* enumerated above, and then there are those that are allocated during startup by calls to
* pthread_key_create; grep for GLOBAL_INIT_THREAD_LOCAL_BUFFER to find those. We need to manually
* maintain that second number, but pthread_test will fail if we forget.
*/
#define TLS_SLOT_BIONIC_PREINIT TLS_SLOT_OPENGL_API
#define GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT 4
#define BIONIC_TLS_SLOTS (64 + TLS_SLOT_FIRST_USER_SLOT + GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT)
/* set the Thread Local Storage, must contain at least BIONIC_TLS_SLOTS pointers */
extern void __init_tls(void** tls, void* thread_info);

14
tests/pthread_test.cpp
View File

@ -28,12 +28,14 @@ TEST(pthread, pthread_key_create) {
ASSERT_EQ(EINVAL, pthread_key_delete(key));
}
#if !defined(__GLIBC__) // glibc uses keys internally that its sysconf value doesn't account for.
TEST(pthread, pthread_key_create_lots) {
// We can allocate _SC_THREAD_KEYS_MAX keys.
std::vector<pthread_key_t> keys;
for (int i = 0; i < sysconf(_SC_THREAD_KEYS_MAX); ++i) {
pthread_key_t key;
ASSERT_EQ(0, pthread_key_create(&key, NULL));
// If this fails, it's likely that GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT is wrong.
ASSERT_EQ(0, pthread_key_create(&key, NULL)) << i << " of " << sysconf(_SC_THREAD_KEYS_MAX);
keys.push_back(key);
}
@ -46,6 +48,7 @@ TEST(pthread, pthread_key_create_lots) {
ASSERT_EQ(0, pthread_key_delete(keys[i]));
}
}
#endif
static void* IdFn(void* arg) {
return arg;
@ -87,6 +90,15 @@ TEST(pthread, pthread_create) {
ASSERT_EQ(expected_result, result);
}
TEST(pthread, pthread_create_EAGAIN) {
pthread_attr_t attributes;
ASSERT_EQ(0, pthread_attr_init(&attributes));
ASSERT_EQ(0, pthread_attr_setstacksize(&attributes, static_cast<size_t>(-1) & ~(getpagesize() - 1)));
pthread_t t;
ASSERT_EQ(EAGAIN, pthread_create(&t, &attributes, IdFn, NULL));
}
TEST(pthread, pthread_no_join_after_detach) {
pthread_t t1;
ASSERT_EQ(0, pthread_create(&t1, NULL, SleepFn, reinterpret_cast<void*>(5)));