1 files changed, 140 insertions, 0 deletions
diff --git a/media/libcubeb/bug1302231_emergency_bailout.patch b/media/libcubeb/bug1302231_emergency_bailout.patch
new file mode 100644
index 0000000000..82152c23f6
--- /dev/null
+++ b/media/libcubeb/bug1302231_emergency_bailout.patch
@@ -0,0 +1,140 @@
+From 37ce70d4400a2ab6b59ee432b41d4ffcc9d136ff Mon Sep 17 00:00:00 2001
+From: Paul Adenot <paul@paul.cx>
+Date: Thu, 10 Nov 2016 21:45:14 +0100
+Subject: [PATCH] Bail out safely from the rendering loop if we could not join
+ the rendering thread in time (#187)
+
+Bail out safely from the rendering loop if we could not join the rendering thread in time.
+---
+ src/cubeb_wasapi.cpp | 41 ++++++++++++++++++++++++++++++++++++-----
+ 1 file changed, 36 insertions(+), 5 deletions(-)
+
+diff --git a/src/cubeb_wasapi.cpp b/src/cubeb_wasapi.cpp
+index 9e689b9..519d5ca 100644
+--- a/src/cubeb_wasapi.cpp
++++ b/src/cubeb_wasapi.cpp
+@@ -22,6 +22,7 @@
+ #include <algorithm>
+ #include <memory>
+ #include <limits>
++#include <atomic>
+ 
+ #include "cubeb/cubeb.h"
+ #include "cubeb-internal.h"
+@@ -220,9 +221,11 @@ struct cubeb_stream
+   float volume;
+   /* True if the stream is draining. */
+   bool draining;
++  /* True when we've destroyed the stream. This pointer is leaked on stream
++   * destruction if we could not join the thread. */
++  std::atomic<std::atomic<bool>*> emergency_bailout;
+ };
+ 
+-
+ class wasapi_endpoint_notification_client : public IMMNotificationClient
+ {
+ public:
+@@ -781,6 +784,7 @@ static unsigned int __stdcall
+ wasapi_stream_render_loop(LPVOID stream)
+ {
+   cubeb_stream * stm = static_cast<cubeb_stream *>(stream);
++  std::atomic<bool> * emergency_bailout = stm->emergency_bailout;
+ 
+   bool is_playing = true;
+   HANDLE wait_array[4] = {
+@@ -820,6 +824,10 @@ wasapi_stream_render_loop(LPVOID stream)
+                                               wait_array,
+                                               FALSE,
+                                               1000);
++    if (*emergency_bailout) {
++      delete emergency_bailout;
++      return 0;
++    }
+     if (waitResult != WAIT_TIMEOUT) {
+       timeout_count = 0;
+     }
+@@ -1134,12 +1142,13 @@ int wasapi_init(cubeb ** context, char const * context_name)
+ }
+ 
+ namespace {
+-void stop_and_join_render_thread(cubeb_stream * stm)
++bool stop_and_join_render_thread(cubeb_stream * stm)
+ {
++  bool rv = true;
+   LOG("Stop and join render thread.");
+   if (!stm->thread) {
+     LOG("No thread present.");
+-    return;
++    return true;
+   }
+ 
+   BOOL ok = SetEvent(stm->shutdown_event);
+@@ -1153,11 +1162,15 @@ void stop_and_join_render_thread(cubeb_stream * stm)
+   if (r == WAIT_TIMEOUT) {
+     /* Something weird happened, leak the thread and continue the shutdown
+      * process. */
++    *(stm->emergency_bailout) = true;
+     LOG("Destroy WaitForSingleObject on thread timed out,"
+         " leaking the thread: %d", GetLastError());
++    rv = false;
+   }
+   if (r == WAIT_FAILED) {
++    *(stm->emergency_bailout) = true;
+     LOG("Destroy WaitForSingleObject on thread failed: %d", GetLastError());
++    rv = false;
+   }
+ 
+   LOG("Closing thread.");
+@@ -1167,6 +1180,8 @@ void stop_and_join_render_thread(cubeb_stream * stm)
+ 
+   CloseHandle(stm->shutdown_event);
+   stm->shutdown_event = 0;
++
++  return rv;
+ }
+ 
+ void wasapi_destroy(cubeb * context)
+@@ -1775,7 +1790,16 @@ void wasapi_stream_destroy(cubeb_stream * stm)
+ {
+   XASSERT(stm);
+ 
+-  stop_and_join_render_thread(stm);
++  // Only free stm->emergency_bailout if we could not join the thread.
++  // If we could not join the thread, stm->emergency_bailout is true 
++  // and is still alive until the thread wakes up and exits cleanly.
++  if (stop_and_join_render_thread(stm)) {
++    delete stm->emergency_bailout.load();
++    stm->emergency_bailout = nullptr;
++  } else {
++    // If we're leaking, it must be that this is true.
++    assert(*(stm->emergency_bailout));
++  }
+ 
+   unregister_notification_client(stm);
+ 
+@@ -1844,6 +1868,8 @@ int wasapi_stream_start(cubeb_stream * stm)
+ 
+   auto_lock lock(stm->stream_reset_lock);
+ 
++  stm->emergency_bailout = new std::atomic<bool>(false);
++
+   if (stm->output_client) {
+     int rv = stream_start_one_side(stm, OUTPUT);
+     if (rv != CUBEB_OK) {
+@@ -1903,7 +1929,12 @@ int wasapi_stream_stop(cubeb_stream * stm)
+     stm->state_callback(stm, stm->user_ptr, CUBEB_STATE_STOPPED);
+   }
+ 
+-  stop_and_join_render_thread(stm);
++  if (stop_and_join_render_thread(stm)) {
++    if (stm->emergency_bailout.load()) {
++      delete stm->emergency_bailout.load();
++      stm->emergency_bailout = nullptr;
++    }
++  }
+ 
+   return CUBEB_OK;
+ }
+-- 
+2.7.4
+