1 files changed, 262 insertions, 0 deletions
diff --git a/base/threading/platform_thread_posix.cc b/base/threading/platform_thread_posix.cc
new file mode 100644
index 000000000000..c924a16d384c
--- /dev/null
+++ b/base/threading/platform_thread_posix.cc
@@ -0,0 +1,262 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/threading/platform_thread.h"
+
+#include <errno.h>
+#include <sched.h>
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/safe_strerror_posix.h"
+#include "base/threading/thread_local.h"
+#include "base/threading/thread_restrictions.h"
+
+#if defined(OS_MACOSX)
+#include <mach/mach.h>
+#include <sys/resource.h>
+#include <algorithm>
+#endif
+
+#if defined(OS_LINUX)
+#include <dlfcn.h>
+#include <sys/prctl.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#endif
+
+#if defined(OS_ANDROID)
+#include "base/android/jni_android.h"
+#endif
+
+#if defined(OS_NACL)
+#include <sys/nacl_syscalls.h>
+#endif
+
+namespace base {
+
+#if defined(OS_MACOSX)
+void InitThreading();
+#endif
+
+namespace {
+
+static ThreadLocalPointer<char> current_thread_name;
+
+struct ThreadParams {
+  PlatformThread::Delegate* delegate;
+  bool joinable;
+};
+
+void* ThreadFunc(void* params) {
+  ThreadParams* thread_params = static_cast<ThreadParams*>(params);
+  PlatformThread::Delegate* delegate = thread_params->delegate;
+  if (!thread_params->joinable)
+    base::ThreadRestrictions::SetSingletonAllowed(false);
+  delete thread_params;
+  delegate->ThreadMain();
+#if defined(OS_ANDROID)
+  base::android::DetachFromVM();
+#endif
+  return NULL;
+}
+
+bool CreateThread(size_t stack_size, bool joinable,
+                  PlatformThread::Delegate* delegate,
+                  PlatformThreadHandle* thread_handle) {
+#if defined(OS_MACOSX)
+  base::InitThreading();
+#endif  // OS_MACOSX
+
+  bool success = false;
+  pthread_attr_t attributes;
+  pthread_attr_init(&attributes);
+
+  // Pthreads are joinable by default, so only specify the detached attribute if
+  // the thread should be non-joinable.
+  if (!joinable) {
+    pthread_attr_setdetachstate(&attributes, PTHREAD_CREATE_DETACHED);
+  }
+
+#if defined(OS_MACOSX)
+  // The Mac OS X default for a pthread stack size is 512kB.
+  // Libc-594.1.4/pthreads/pthread.c's pthread_attr_init uses
+  // DEFAULT_STACK_SIZE for this purpose.
+  //
+  // 512kB isn't quite generous enough for some deeply recursive threads that
+  // otherwise request the default stack size by specifying 0. Here, adopt
+  // glibc's behavior as on Linux, which is to use the current stack size
+  // limit (ulimit -s) as the default stack size. See
+  // glibc-2.11.1/nptl/nptl-init.c's __pthread_initialize_minimal_internal. To
+  // avoid setting the limit below the Mac OS X default or the minimum usable
+  // stack size, these values are also considered. If any of these values
+  // can't be determined, or if stack size is unlimited (ulimit -s unlimited),
+  // stack_size is left at 0 to get the system default.
+  //
+  // Mac OS X normally only applies ulimit -s to the main thread stack. On
+  // contemporary OS X and Linux systems alike, this value is generally 8MB
+  // or in that neighborhood.
+  if (stack_size == 0) {
+    size_t default_stack_size;
+    struct rlimit stack_rlimit;
+    if (pthread_attr_getstacksize(&attributes, &default_stack_size) == 0 &&
+        getrlimit(RLIMIT_STACK, &stack_rlimit) == 0 &&
+        stack_rlimit.rlim_cur != RLIM_INFINITY) {
+      stack_size = std::max(std::max(default_stack_size,
+                                     static_cast<size_t>(PTHREAD_STACK_MIN)),
+                            static_cast<size_t>(stack_rlimit.rlim_cur));
+    }
+  }
+#endif  // OS_MACOSX
+
+  if (stack_size > 0)
+    pthread_attr_setstacksize(&attributes, stack_size);
+
+  ThreadParams* params = new ThreadParams;
+  params->delegate = delegate;
+  params->joinable = joinable;
+  success = !pthread_create(thread_handle, &attributes, ThreadFunc, params);
+
+  pthread_attr_destroy(&attributes);
+  if (!success)
+    delete params;
+  return success;
+}
+
+}  // namespace
+
+// static
+PlatformThreadId PlatformThread::CurrentId() {
+  // Pthreads doesn't have the concept of a thread ID, so we have to reach down
+  // into the kernel.
+#if defined(OS_MACOSX)
+  return mach_thread_self();
+#elif defined(OS_LINUX)
+  return syscall(__NR_gettid);
+#elif defined(OS_ANDROID)
+  return gettid();
+#elif defined(OS_FREEBSD)
+  // TODO(BSD): find a better thread ID
+  return reinterpret_cast<int64>(pthread_self());
+#elif defined(OS_NACL) || defined(OS_SOLARIS)
+  return pthread_self();
+#endif
+}
+
+// static
+void PlatformThread::YieldCurrentThread() {
+  sched_yield();
+}
+
+// static
+void PlatformThread::Sleep(int duration_ms) {
+  struct timespec sleep_time, remaining;
+
+  // Contains the portion of duration_ms >= 1 sec.
+  sleep_time.tv_sec = duration_ms / 1000;
+  duration_ms -= sleep_time.tv_sec * 1000;
+
+  // Contains the portion of duration_ms < 1 sec.
+  sleep_time.tv_nsec = duration_ms * 1000 * 1000;  // nanoseconds.
+
+  while (nanosleep(&sleep_time, &remaining) == -1 && errno == EINTR)
+    sleep_time = remaining;
+}
+
+// Linux SetName is currently disabled, as we need to distinguish between
+// helper threads (where it's ok to make this call) and the main thread
+// (where making this call renames our process, causing tools like killall
+// to stop working).
+#if 0 && defined(OS_LINUX)
+// static
+void PlatformThread::SetName(const char* name) {
+  // have to cast away const because ThreadLocalPointer does not support const
+  // void*
+  current_thread_name.Set(const_cast<char*>(name));
+
+  // http://0pointer.de/blog/projects/name-your-threads.html
+
+  // glibc recently added support for pthread_setname_np, but it's not
+  // commonly available yet.  So test for it at runtime.
+  int (*dynamic_pthread_setname_np)(pthread_t, const char*);
+  *reinterpret_cast<void**>(&dynamic_pthread_setname_np) =
+      dlsym(RTLD_DEFAULT, "pthread_setname_np");
+
+  if (dynamic_pthread_setname_np) {
+    // This limit comes from glibc, which gets it from the kernel
+    // (TASK_COMM_LEN).
+    const int kMaxNameLength = 15;
+    std::string shortened_name = std::string(name).substr(0, kMaxNameLength);
+    int err = dynamic_pthread_setname_np(pthread_self(),
+                                         shortened_name.c_str());
+    if (err < 0)
+      LOG(ERROR) << "pthread_setname_np: " << safe_strerror(err);
+  } else {
+    // Implementing this function without glibc is simple enough.  (We
+    // don't do the name length clipping as above because it will be
+    // truncated by the callee (see TASK_COMM_LEN above).)
+    int err = prctl(PR_SET_NAME, name);
+    if (err < 0)
+      PLOG(ERROR) << "prctl(PR_SET_NAME)";
+  }
+}
+#elif defined(OS_MACOSX)
+// Mac is implemented in platform_thread_mac.mm.
+#else
+// static
+void PlatformThread::SetName(const char* name) {
+  // have to cast away const because ThreadLocalPointer does not support const
+  // void*
+  current_thread_name.Set(const_cast<char*>(name));
+
+  // (This should be relatively simple to implement for the BSDs; I
+  // just don't have one handy to test the code on.)
+}
+#endif  // defined(OS_LINUX)
+
+
+#if !defined(OS_MACOSX)
+// Mac is implemented in platform_thread_mac.mm.
+// static
+const char* PlatformThread::GetName() {
+  return current_thread_name.Get();
+}
+#endif
+
+// static
+bool PlatformThread::Create(size_t stack_size, Delegate* delegate,
+                            PlatformThreadHandle* thread_handle) {
+  return CreateThread(stack_size, true /* joinable thread */,
+                      delegate, thread_handle);
+}
+
+// static
+bool PlatformThread::CreateNonJoinable(size_t stack_size, Delegate* delegate) {
+  PlatformThreadHandle unused;
+
+  bool result = CreateThread(stack_size, false /* non-joinable thread */,
+                             delegate, &unused);
+  return result;
+}
+
+// static
+void PlatformThread::Join(PlatformThreadHandle thread_handle) {
+  // Joining another thread may block the current thread for a long time, since
+  // the thread referred to by |thread_handle| may still be running long-lived /
+  // blocking tasks.
+  base::ThreadRestrictions::AssertIOAllowed();
+  pthread_join(thread_handle, NULL);
+}
+
+#if !defined(OS_MACOSX)
+// Mac OS X uses lower-level mach APIs
+
+// static
+void PlatformThread::SetThreadPriority(PlatformThreadHandle, ThreadPriority) {
+  // TODO(crogers): implement
+  NOTIMPLEMENTED();
+}
+#endif
+
+}  // namespace base