Port the Thread class properly to Mac and Linux. This involved porting

PlatformThread and creating an API on PlatformThread to create a native thread
and later join with it.  I also made a few other tweaks to PlatformThread, such
as eliminating the Current() method which appears to be unused.  The
operator==() is also unused, so I killed it as well.

I made a few other miscellaneous cleanups and adjustments.


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@1146 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 107 insertions, 0 deletions

diff --git a/base/platform_thread_posix.cc b/base/platform_thread_posix.cc
new file mode 100644
index 0000000..00d76dd
--- /dev/null
+++ b/base/platform_thread_posix.cc
@@ -0,0 +1,107 @@
+// Copyright 2008, Google Inc.
+// 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.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// 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 "base/platform_thread.h"
+
+#include <errno.h>
+#include <sched.h>
+
+#if defined(OS_MACOSX)
+#include <mach/mach.h>
+#elif defined(OS_LINUX)
+#include <sys/syscall.h>
+#include <unistd.h>
+#endif
+
+static void* ThreadFunc(void* closure) {
+  PlatformThread::Delegate* delegate =
+      static_cast<PlatformThread::Delegate*>(closure);
+  delegate->ThreadMain(); 
+  return NULL;
+}
+
+// static
+int 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);
+#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;
+}
+
+// static
+void PlatformThread::SetName(int thread_id, const char* name) {
+  // TODO(darin): implement me!
+}
+
+// static
+bool PlatformThread::Create(size_t stack_size, Delegate* delegate,
+                            PlatformThreadHandle* thread_handle) {
+  bool success = false;
+  pthread_attr_t attributes;
+  pthread_attr_init(&attributes);
+
+  // Pthreads are joinable by default, so we don't need to specify any special
+  // attributes to be able to call pthread_join later.
+  
+  if (stack_size > 0)
+    pthread_attr_setstacksize(&attributes, stack_size);
+
+  success = !pthread_create(thread_handle, &attributes, ThreadFunc, delegate);
+  
+  pthread_attr_destroy(&attributes);
+  return success;
+}
+
+// static
+void PlatformThread::Join(PlatformThreadHandle thread_handle) {
+  pthread_join(thread_handle, NULL);
+}