ref: 3a3b0be09a11a9db7d2c1322cfbb8bd9b670a079
parent: fc5f3b8f4f170a32207ca2eca60f87bb0a01d03c
author: Jingning Han <jingning@google.com>
date: Wed Jul 1 10:58:13 EDT 2015
Move multi-threading module functions into vpx_thread folder This commit moves the primitive multi-threading files from vp9 folder to vpx_thread, which will be accessible by all vpx codec. Change-Id: Ib51e66e9c69801c10631fab56d35a0c0aaed5883
--- a/libs.mk
+++ b/libs.mk
@@ -50,6 +50,9 @@
include $(SRC_PATH_BARE)/vpx_dsp/vpx_dsp.mk
CODEC_SRCS-yes += $(addprefix vpx_dsp/,$(call enabled,DSP_SRCS))
+include $(SRC_PATH_BARE)/vpx_thread/vpx_thread.mk
+CODEC_SRCS-yes += $(addprefix vpx_thread/,$(call enabled,THREAD_SRCS))
+
ifneq ($(CONFIG_VP8_ENCODER)$(CONFIG_VP8_DECODER),)
VP8_PREFIX=vp8/
include $(SRC_PATH_BARE)/$(VP8_PREFIX)vp8_common.mk
--- a/test/vp9_thread_test.cc
+++ b/test/vp9_thread_test.cc
@@ -18,7 +18,7 @@
#if CONFIG_WEBM_IO
#include "test/webm_video_source.h"
#endif
-#include "vp9/common/vp9_thread.h"
+#include "vpx_thread/vpx_thread.h"
namespace {--- a/vp9/common/vp9_onyxc_int.h
+++ b/vp9/common/vp9_onyxc_int.h
@@ -13,6 +13,7 @@
#include "./vpx_config.h"
#include "vpx/internal/vpx_codec_internal.h"
+#include "vpx_thread/vpx_thread.h"
#include "./vp9_rtcd.h"
#include "vp9/common/vp9_alloccommon.h"
#include "vp9/common/vp9_loopfilter.h"
@@ -21,7 +22,6 @@
#include "vp9/common/vp9_entropymode.h"
#include "vp9/common/vp9_frame_buffers.h"
#include "vp9/common/vp9_quant_common.h"
-#include "vp9/common/vp9_thread.h"
#include "vp9/common/vp9_tile_common.h"
#if CONFIG_VP9_POSTPROC
--- a/vp9/common/vp9_thread.c
+++ /dev/null
@@ -1,184 +1,0 @@
-// Copyright 2013 Google Inc. All Rights Reserved.
-//
-// Use of this source code is governed by a BSD-style license
-// that can be found in the COPYING file in the root of the source
-// tree. An additional intellectual property rights grant can be found
-// in the file PATENTS. All contributing project authors may
-// be found in the AUTHORS file in the root of the source tree.
-// -----------------------------------------------------------------------------
-//
-// Multi-threaded worker
-//
-// Original source:
-// http://git.chromium.org/webm/libwebp.git
-// 100644 blob 264210ba2807e4da47eb5d18c04cf869d89b9784 src/utils/thread.c
-
-#include <assert.h>
-#include <string.h> // for memset()
-#include "./vp9_thread.h"
-#include "vpx_mem/vpx_mem.h"
-
-#if CONFIG_MULTITHREAD
-
-struct VP9WorkerImpl {- pthread_mutex_t mutex_;
- pthread_cond_t condition_;
- pthread_t thread_;
-};
-
-//------------------------------------------------------------------------------
-
-static void execute(VP9Worker *const worker); // Forward declaration.
-
-static THREADFN thread_loop(void *ptr) {- VP9Worker *const worker = (VP9Worker*)ptr;
- int done = 0;
- while (!done) {- pthread_mutex_lock(&worker->impl_->mutex_);
- while (worker->status_ == OK) { // wait in idling mode- pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
- }
- if (worker->status_ == WORK) {- execute(worker);
- worker->status_ = OK;
- } else if (worker->status_ == NOT_OK) { // finish the worker- done = 1;
- }
- // signal to the main thread that we're done (for sync())
- pthread_cond_signal(&worker->impl_->condition_);
- pthread_mutex_unlock(&worker->impl_->mutex_);
- }
- return THREAD_RETURN(NULL); // Thread is finished
-}
-
-// main thread state control
-static void change_state(VP9Worker *const worker,
- VP9WorkerStatus new_status) {- // No-op when attempting to change state on a thread that didn't come up.
- // Checking status_ without acquiring the lock first would result in a data
- // race.
- if (worker->impl_ == NULL) return;
-
- pthread_mutex_lock(&worker->impl_->mutex_);
- if (worker->status_ >= OK) {- // wait for the worker to finish
- while (worker->status_ != OK) {- pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
- }
- // assign new status and release the working thread if needed
- if (new_status != OK) {- worker->status_ = new_status;
- pthread_cond_signal(&worker->impl_->condition_);
- }
- }
- pthread_mutex_unlock(&worker->impl_->mutex_);
-}
-
-#endif // CONFIG_MULTITHREAD
-
-//------------------------------------------------------------------------------
-
-static void init(VP9Worker *const worker) {- memset(worker, 0, sizeof(*worker));
- worker->status_ = NOT_OK;
-}
-
-static int sync(VP9Worker *const worker) {-#if CONFIG_MULTITHREAD
- change_state(worker, OK);
-#endif
- assert(worker->status_ <= OK);
- return !worker->had_error;
-}
-
-static int reset(VP9Worker *const worker) {- int ok = 1;
- worker->had_error = 0;
- if (worker->status_ < OK) {-#if CONFIG_MULTITHREAD
- worker->impl_ = (VP9WorkerImpl*)vpx_calloc(1, sizeof(*worker->impl_));
- if (worker->impl_ == NULL) {- return 0;
- }
- if (pthread_mutex_init(&worker->impl_->mutex_, NULL)) {- goto Error;
- }
- if (pthread_cond_init(&worker->impl_->condition_, NULL)) {- pthread_mutex_destroy(&worker->impl_->mutex_);
- goto Error;
- }
- pthread_mutex_lock(&worker->impl_->mutex_);
- ok = !pthread_create(&worker->impl_->thread_, NULL, thread_loop, worker);
- if (ok) worker->status_ = OK;
- pthread_mutex_unlock(&worker->impl_->mutex_);
- if (!ok) {- pthread_mutex_destroy(&worker->impl_->mutex_);
- pthread_cond_destroy(&worker->impl_->condition_);
- Error:
- vpx_free(worker->impl_);
- worker->impl_ = NULL;
- return 0;
- }
-#else
- worker->status_ = OK;
-#endif
- } else if (worker->status_ > OK) {- ok = sync(worker);
- }
- assert(!ok || (worker->status_ == OK));
- return ok;
-}
-
-static void execute(VP9Worker *const worker) {- if (worker->hook != NULL) {- worker->had_error |= !worker->hook(worker->data1, worker->data2);
- }
-}
-
-static void launch(VP9Worker *const worker) {-#if CONFIG_MULTITHREAD
- change_state(worker, WORK);
-#else
- execute(worker);
-#endif
-}
-
-static void end(VP9Worker *const worker) {-#if CONFIG_MULTITHREAD
- if (worker->impl_ != NULL) {- change_state(worker, NOT_OK);
- pthread_join(worker->impl_->thread_, NULL);
- pthread_mutex_destroy(&worker->impl_->mutex_);
- pthread_cond_destroy(&worker->impl_->condition_);
- vpx_free(worker->impl_);
- worker->impl_ = NULL;
- }
-#else
- worker->status_ = NOT_OK;
- assert(worker->impl_ == NULL);
-#endif
- assert(worker->status_ == NOT_OK);
-}
-
-//------------------------------------------------------------------------------
-
-static VP9WorkerInterface g_worker_interface = {- init, reset, sync, launch, execute, end
-};
-
-int vp9_set_worker_interface(const VP9WorkerInterface* const winterface) {- if (winterface == NULL ||
- winterface->init == NULL || winterface->reset == NULL ||
- winterface->sync == NULL || winterface->launch == NULL ||
- winterface->execute == NULL || winterface->end == NULL) {- return 0;
- }
- g_worker_interface = *winterface;
- return 1;
-}
-
-const VP9WorkerInterface *vp9_get_worker_interface(void) {- return &g_worker_interface;
-}
-
-//------------------------------------------------------------------------------
--- a/vp9/common/vp9_thread.h
+++ /dev/null
@@ -1,223 +1,0 @@
-// Copyright 2013 Google Inc. All Rights Reserved.
-//
-// Use of this source code is governed by a BSD-style license
-// that can be found in the COPYING file in the root of the source
-// tree. An additional intellectual property rights grant can be found
-// in the file PATENTS. All contributing project authors may
-// be found in the AUTHORS file in the root of the source tree.
-// -----------------------------------------------------------------------------
-//
-// Multi-threaded worker
-//
-// Original source:
-// http://git.chromium.org/webm/libwebp.git
-// 100644 blob 7bd451b124ae3b81596abfbcc823e3cb129d3a38 src/utils/thread.h
-
-#ifndef VP9_DECODER_VP9_THREAD_H_
-#define VP9_DECODER_VP9_THREAD_H_
-
-#include "./vpx_config.h"
-
-#ifdef __cplusplus
-extern "C" {-#endif
-
-// Set maximum decode threads to be 8 due to the limit of frame buffers
-// and not enough semaphores in the emulation layer on windows.
-#define MAX_DECODE_THREADS 8
-
-#if CONFIG_MULTITHREAD
-
-#if defined(_WIN32) && !HAVE_PTHREAD_H
-#include <errno.h> // NOLINT
-#include <process.h> // NOLINT
-#include <windows.h> // NOLINT
-typedef HANDLE pthread_t;
-typedef CRITICAL_SECTION pthread_mutex_t;
-typedef struct {- HANDLE waiting_sem_;
- HANDLE received_sem_;
- HANDLE signal_event_;
-} pthread_cond_t;
-
-//------------------------------------------------------------------------------
-// simplistic pthread emulation layer
-
-// _beginthreadex requires __stdcall
-#define THREADFN unsigned int __stdcall
-#define THREAD_RETURN(val) (unsigned int)((DWORD_PTR)val)
-
-static INLINE int pthread_create(pthread_t* const thread, const void* attr,
- unsigned int (__stdcall *start)(void*),
- void* arg) {- (void)attr;
- *thread = (pthread_t)_beginthreadex(NULL, /* void *security */
- 0, /* unsigned stack_size */
- start,
- arg,
- 0, /* unsigned initflag */
- NULL); /* unsigned *thrdaddr */
- if (*thread == NULL) return 1;
- SetThreadPriority(*thread, THREAD_PRIORITY_ABOVE_NORMAL);
- return 0;
-}
-
-static INLINE int pthread_join(pthread_t thread, void** value_ptr) {- (void)value_ptr;
- return (WaitForSingleObject(thread, INFINITE) != WAIT_OBJECT_0 ||
- CloseHandle(thread) == 0);
-}
-
-// Mutex
-static INLINE int pthread_mutex_init(pthread_mutex_t *const mutex,
- void* mutexattr) {- (void)mutexattr;
- InitializeCriticalSection(mutex);
- return 0;
-}
-
-static INLINE int pthread_mutex_trylock(pthread_mutex_t *const mutex) {- return TryEnterCriticalSection(mutex) ? 0 : EBUSY;
-}
-
-static INLINE int pthread_mutex_lock(pthread_mutex_t *const mutex) {- EnterCriticalSection(mutex);
- return 0;
-}
-
-static INLINE int pthread_mutex_unlock(pthread_mutex_t *const mutex) {- LeaveCriticalSection(mutex);
- return 0;
-}
-
-static INLINE int pthread_mutex_destroy(pthread_mutex_t *const mutex) {- DeleteCriticalSection(mutex);
- return 0;
-}
-
-// Condition
-static INLINE int pthread_cond_destroy(pthread_cond_t *const condition) {- int ok = 1;
- ok &= (CloseHandle(condition->waiting_sem_) != 0);
- ok &= (CloseHandle(condition->received_sem_) != 0);
- ok &= (CloseHandle(condition->signal_event_) != 0);
- return !ok;
-}
-
-static INLINE int pthread_cond_init(pthread_cond_t *const condition,
- void* cond_attr) {- (void)cond_attr;
- condition->waiting_sem_ = CreateSemaphore(NULL, 0, MAX_DECODE_THREADS, NULL);
- condition->received_sem_ = CreateSemaphore(NULL, 0, MAX_DECODE_THREADS, NULL);
- condition->signal_event_ = CreateEvent(NULL, FALSE, FALSE, NULL);
- if (condition->waiting_sem_ == NULL ||
- condition->received_sem_ == NULL ||
- condition->signal_event_ == NULL) {- pthread_cond_destroy(condition);
- return 1;
- }
- return 0;
-}
-
-static INLINE int pthread_cond_signal(pthread_cond_t *const condition) {- int ok = 1;
- if (WaitForSingleObject(condition->waiting_sem_, 0) == WAIT_OBJECT_0) {- // a thread is waiting in pthread_cond_wait: allow it to be notified
- ok = SetEvent(condition->signal_event_);
- // wait until the event is consumed so the signaler cannot consume
- // the event via its own pthread_cond_wait.
- ok &= (WaitForSingleObject(condition->received_sem_, INFINITE) !=
- WAIT_OBJECT_0);
- }
- return !ok;
-}
-
-static INLINE int pthread_cond_wait(pthread_cond_t *const condition,
- pthread_mutex_t *const mutex) {- int ok;
- // note that there is a consumer available so the signal isn't dropped in
- // pthread_cond_signal
- if (!ReleaseSemaphore(condition->waiting_sem_, 1, NULL))
- return 1;
- // now unlock the mutex so pthread_cond_signal may be issued
- pthread_mutex_unlock(mutex);
- ok = (WaitForSingleObject(condition->signal_event_, INFINITE) ==
- WAIT_OBJECT_0);
- ok &= ReleaseSemaphore(condition->received_sem_, 1, NULL);
- pthread_mutex_lock(mutex);
- return !ok;
-}
-#else // _WIN32
-#include <pthread.h> // NOLINT
-# define THREADFN void*
-# define THREAD_RETURN(val) val
-#endif
-
-#endif // CONFIG_MULTITHREAD
-
-// State of the worker thread object
-typedef enum {- NOT_OK = 0, // object is unusable
- OK, // ready to work
- WORK // busy finishing the current task
-} VP9WorkerStatus;
-
-// Function to be called by the worker thread. Takes two opaque pointers as
-// arguments (data1 and data2), and should return false in case of error.
-typedef int (*VP9WorkerHook)(void*, void*);
-
-// Platform-dependent implementation details for the worker.
-typedef struct VP9WorkerImpl VP9WorkerImpl;
-
-// Synchronization object used to launch job in the worker thread
-typedef struct {- VP9WorkerImpl *impl_;
- VP9WorkerStatus status_;
- VP9WorkerHook hook; // hook to call
- void *data1; // first argument passed to 'hook'
- void *data2; // second argument passed to 'hook'
- int had_error; // return value of the last call to 'hook'
-} VP9Worker;
-
-// The interface for all thread-worker related functions. All these functions
-// must be implemented.
-typedef struct {- // Must be called first, before any other method.
- void (*init)(VP9Worker *const worker);
- // Must be called to initialize the object and spawn the thread. Re-entrant.
- // Will potentially launch the thread. Returns false in case of error.
- int (*reset)(VP9Worker *const worker);
- // Makes sure the previous work is finished. Returns true if worker->had_error
- // was not set and no error condition was triggered by the working thread.
- int (*sync)(VP9Worker *const worker);
- // Triggers the thread to call hook() with data1 and data2 arguments. These
- // hook/data1/data2 values can be changed at any time before calling this
- // function, but not be changed afterward until the next call to Sync().
- void (*launch)(VP9Worker *const worker);
- // This function is similar to launch() except that it calls the
- // hook directly instead of using a thread. Convenient to bypass the thread
- // mechanism while still using the VP9Worker structs. sync() must
- // still be called afterward (for error reporting).
- void (*execute)(VP9Worker *const worker);
- // Kill the thread and terminate the object. To use the object again, one
- // must call reset() again.
- void (*end)(VP9Worker *const worker);
-} VP9WorkerInterface;
-
-// Install a new set of threading functions, overriding the defaults. This
-// should be done before any workers are started, i.e., before any encoding or
-// decoding takes place. The contents of the interface struct are copied, it
-// is safe to free the corresponding memory after this call. This function is
-// not thread-safe. Return false in case of invalid pointer or methods.
-int vp9_set_worker_interface(const VP9WorkerInterface *const winterface);
-
-// Retrieve the currently set thread worker interface.
-const VP9WorkerInterface *vp9_get_worker_interface(void);
-
-//------------------------------------------------------------------------------
-
-#ifdef __cplusplus
-} // extern "C"
-#endif
-
-#endif // VP9_DECODER_VP9_THREAD_H_
--- a/vp9/common/vp9_thread_common.h
+++ b/vp9/common/vp9_thread_common.h
@@ -12,7 +12,7 @@
#define VP9_COMMON_VP9_LOOPFILTER_THREAD_H_
#include "./vpx_config.h"
#include "vp9/common/vp9_loopfilter.h"
-#include "vp9/common/vp9_thread.h"
+#include "vpx_thread/vpx_thread.h"
struct VP9Common;
struct FRAME_COUNTS;
--- a/vp9/decoder/vp9_decodeframe.c
+++ b/vp9/decoder/vp9_decodeframe.c
@@ -18,6 +18,7 @@
#include "vpx_ports/mem.h"
#include "vpx_ports/mem_ops.h"
#include "vpx_scale/vpx_scale.h"
+#include "vpx_thread/vpx_thread.h"
#include "vp9/common/vp9_alloccommon.h"
#include "vp9/common/vp9_common.h"
@@ -30,7 +31,6 @@
#include "vp9/common/vp9_reconintra.h"
#include "vp9/common/vp9_reconinter.h"
#include "vp9/common/vp9_seg_common.h"
-#include "vp9/common/vp9_thread.h"
#include "vp9/common/vp9_tile_common.h"
#include "vp9/decoder/vp9_decodeframe.h"
--- a/vp9/decoder/vp9_decoder.c
+++ b/vp9/decoder/vp9_decoder.c
@@ -20,6 +20,7 @@
#include "vpx_ports/vpx_once.h"
#include "vpx_ports/vpx_timer.h"
#include "vpx_scale/vpx_scale.h"
+#include "vpx_thread/vpx_thread.h"
#include "vp9/common/vp9_alloccommon.h"
#include "vp9/common/vp9_loopfilter.h"
@@ -30,7 +31,6 @@
#include "vp9/common/vp9_quant_common.h"
#include "vp9/common/vp9_reconintra.h"
#include "vp9/common/vp9_systemdependent.h"
-#include "vp9/common/vp9_thread.h"
#include "vp9/decoder/vp9_decodeframe.h"
#include "vp9/decoder/vp9_decoder.h"
--- a/vp9/decoder/vp9_decoder.h
+++ b/vp9/decoder/vp9_decoder.h
@@ -15,10 +15,11 @@
#include "vpx/vpx_codec.h"
#include "vpx_scale/yv12config.h"
+#include "vpx_thread/vpx_thread.h"
+
#include "vp9/common/vp9_thread_common.h"
#include "vp9/common/vp9_onyxc_int.h"
#include "vp9/common/vp9_ppflags.h"
-#include "vp9/common/vp9_thread.h"
#include "vp9/decoder/vp9_dthread.h"
#include "vp9/decoder/vp9_reader.h"
--- a/vp9/decoder/vp9_dthread.h
+++ b/vp9/decoder/vp9_dthread.h
@@ -12,7 +12,7 @@
#define VP9_DECODER_VP9_DTHREAD_H_
#include "./vpx_config.h"
-#include "vp9/common/vp9_thread.h"
+#include "vpx_thread/vpx_thread.h"
#include "vpx/internal/vpx_codec_internal.h"
struct VP9Common;
--- a/vp9/encoder/vp9_encoder.h
+++ b/vp9/encoder/vp9_encoder.h
@@ -16,6 +16,7 @@
#include "./vpx_config.h"
#include "vpx/internal/vpx_codec_internal.h"
#include "vpx/vp8cx.h"
+#include "vpx_thread/vpx_thread.h"
#include "vp9/common/vp9_alloccommon.h"
#include "vp9/common/vp9_ppflags.h"
@@ -22,7 +23,6 @@
#include "vp9/common/vp9_entropymode.h"
#include "vp9/common/vp9_thread_common.h"
#include "vp9/common/vp9_onyxc_int.h"
-#include "vp9/common/vp9_thread.h"
#include "vp9/encoder/vp9_aq_cyclicrefresh.h"
#include "vp9/encoder/vp9_context_tree.h"
--- a/vp9/vp9_common.mk
+++ b/vp9/vp9_common.mk
@@ -51,8 +51,6 @@
VP9_COMMON_SRCS-yes += common/vp9_seg_common.c
VP9_COMMON_SRCS-yes += common/vp9_systemdependent.h
VP9_COMMON_SRCS-yes += common/vp9_textblit.h
-VP9_COMMON_SRCS-yes += common/vp9_thread.h
-VP9_COMMON_SRCS-yes += common/vp9_thread.c
VP9_COMMON_SRCS-yes += common/vp9_tile_common.h
VP9_COMMON_SRCS-yes += common/vp9_tile_common.c
VP9_COMMON_SRCS-yes += common/vp9_loopfilter.c
--- a/vp9/vp9_dx_iface.c
+++ b/vp9/vp9_dx_iface.c
@@ -17,10 +17,10 @@
#include "vpx/internal/vpx_codec_internal.h"
#include "vpx/vp8dx.h"
#include "vpx/vpx_decoder.h"
+#include "vpx_thread/vpx_thread.h"
#include "vp9/common/vp9_alloccommon.h"
#include "vp9/common/vp9_frame_buffers.h"
-#include "vp9/common/vp9_thread.h"
#include "vp9/decoder/vp9_decoder.h"
#include "vp9/decoder/vp9_decodeframe.h"
--- /dev/null
+++ b/vpx_thread/vpx_thread.c
@@ -1,0 +1,184 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Multi-threaded worker
+//
+// Original source:
+// http://git.chromium.org/webm/libwebp.git
+// 100644 blob 264210ba2807e4da47eb5d18c04cf869d89b9784 src/utils/thread.c
+
+#include <assert.h>
+#include <string.h> // for memset()
+#include "./vpx_thread.h"
+#include "vpx_mem/vpx_mem.h"
+
+#if CONFIG_MULTITHREAD
+
+struct VP9WorkerImpl {+ pthread_mutex_t mutex_;
+ pthread_cond_t condition_;
+ pthread_t thread_;
+};
+
+//------------------------------------------------------------------------------
+
+static void execute(VP9Worker *const worker); // Forward declaration.
+
+static THREADFN thread_loop(void *ptr) {+ VP9Worker *const worker = (VP9Worker*)ptr;
+ int done = 0;
+ while (!done) {+ pthread_mutex_lock(&worker->impl_->mutex_);
+ while (worker->status_ == OK) { // wait in idling mode+ pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
+ }
+ if (worker->status_ == WORK) {+ execute(worker);
+ worker->status_ = OK;
+ } else if (worker->status_ == NOT_OK) { // finish the worker+ done = 1;
+ }
+ // signal to the main thread that we're done (for sync())
+ pthread_cond_signal(&worker->impl_->condition_);
+ pthread_mutex_unlock(&worker->impl_->mutex_);
+ }
+ return THREAD_RETURN(NULL); // Thread is finished
+}
+
+// main thread state control
+static void change_state(VP9Worker *const worker,
+ VP9WorkerStatus new_status) {+ // No-op when attempting to change state on a thread that didn't come up.
+ // Checking status_ without acquiring the lock first would result in a data
+ // race.
+ if (worker->impl_ == NULL) return;
+
+ pthread_mutex_lock(&worker->impl_->mutex_);
+ if (worker->status_ >= OK) {+ // wait for the worker to finish
+ while (worker->status_ != OK) {+ pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
+ }
+ // assign new status and release the working thread if needed
+ if (new_status != OK) {+ worker->status_ = new_status;
+ pthread_cond_signal(&worker->impl_->condition_);
+ }
+ }
+ pthread_mutex_unlock(&worker->impl_->mutex_);
+}
+
+#endif // CONFIG_MULTITHREAD
+
+//------------------------------------------------------------------------------
+
+static void init(VP9Worker *const worker) {+ memset(worker, 0, sizeof(*worker));
+ worker->status_ = NOT_OK;
+}
+
+static int sync(VP9Worker *const worker) {+#if CONFIG_MULTITHREAD
+ change_state(worker, OK);
+#endif
+ assert(worker->status_ <= OK);
+ return !worker->had_error;
+}
+
+static int reset(VP9Worker *const worker) {+ int ok = 1;
+ worker->had_error = 0;
+ if (worker->status_ < OK) {+#if CONFIG_MULTITHREAD
+ worker->impl_ = (VP9WorkerImpl*)vpx_calloc(1, sizeof(*worker->impl_));
+ if (worker->impl_ == NULL) {+ return 0;
+ }
+ if (pthread_mutex_init(&worker->impl_->mutex_, NULL)) {+ goto Error;
+ }
+ if (pthread_cond_init(&worker->impl_->condition_, NULL)) {+ pthread_mutex_destroy(&worker->impl_->mutex_);
+ goto Error;
+ }
+ pthread_mutex_lock(&worker->impl_->mutex_);
+ ok = !pthread_create(&worker->impl_->thread_, NULL, thread_loop, worker);
+ if (ok) worker->status_ = OK;
+ pthread_mutex_unlock(&worker->impl_->mutex_);
+ if (!ok) {+ pthread_mutex_destroy(&worker->impl_->mutex_);
+ pthread_cond_destroy(&worker->impl_->condition_);
+ Error:
+ vpx_free(worker->impl_);
+ worker->impl_ = NULL;
+ return 0;
+ }
+#else
+ worker->status_ = OK;
+#endif
+ } else if (worker->status_ > OK) {+ ok = sync(worker);
+ }
+ assert(!ok || (worker->status_ == OK));
+ return ok;
+}
+
+static void execute(VP9Worker *const worker) {+ if (worker->hook != NULL) {+ worker->had_error |= !worker->hook(worker->data1, worker->data2);
+ }
+}
+
+static void launch(VP9Worker *const worker) {+#if CONFIG_MULTITHREAD
+ change_state(worker, WORK);
+#else
+ execute(worker);
+#endif
+}
+
+static void end(VP9Worker *const worker) {+#if CONFIG_MULTITHREAD
+ if (worker->impl_ != NULL) {+ change_state(worker, NOT_OK);
+ pthread_join(worker->impl_->thread_, NULL);
+ pthread_mutex_destroy(&worker->impl_->mutex_);
+ pthread_cond_destroy(&worker->impl_->condition_);
+ vpx_free(worker->impl_);
+ worker->impl_ = NULL;
+ }
+#else
+ worker->status_ = NOT_OK;
+ assert(worker->impl_ == NULL);
+#endif
+ assert(worker->status_ == NOT_OK);
+}
+
+//------------------------------------------------------------------------------
+
+static VP9WorkerInterface g_worker_interface = {+ init, reset, sync, launch, execute, end
+};
+
+int vp9_set_worker_interface(const VP9WorkerInterface* const winterface) {+ if (winterface == NULL ||
+ winterface->init == NULL || winterface->reset == NULL ||
+ winterface->sync == NULL || winterface->launch == NULL ||
+ winterface->execute == NULL || winterface->end == NULL) {+ return 0;
+ }
+ g_worker_interface = *winterface;
+ return 1;
+}
+
+const VP9WorkerInterface *vp9_get_worker_interface(void) {+ return &g_worker_interface;
+}
+
+//------------------------------------------------------------------------------
--- /dev/null
+++ b/vpx_thread/vpx_thread.h
@@ -1,0 +1,223 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Multi-threaded worker
+//
+// Original source:
+// http://git.chromium.org/webm/libwebp.git
+// 100644 blob 7bd451b124ae3b81596abfbcc823e3cb129d3a38 src/utils/thread.h
+
+#ifndef VP9_DECODER_VP9_THREAD_H_
+#define VP9_DECODER_VP9_THREAD_H_
+
+#include "./vpx_config.h"
+
+#ifdef __cplusplus
+extern "C" {+#endif
+
+// Set maximum decode threads to be 8 due to the limit of frame buffers
+// and not enough semaphores in the emulation layer on windows.
+#define MAX_DECODE_THREADS 8
+
+#if CONFIG_MULTITHREAD
+
+#if defined(_WIN32) && !HAVE_PTHREAD_H
+#include <errno.h> // NOLINT
+#include <process.h> // NOLINT
+#include <windows.h> // NOLINT
+typedef HANDLE pthread_t;
+typedef CRITICAL_SECTION pthread_mutex_t;
+typedef struct {+ HANDLE waiting_sem_;
+ HANDLE received_sem_;
+ HANDLE signal_event_;
+} pthread_cond_t;
+
+//------------------------------------------------------------------------------
+// simplistic pthread emulation layer
+
+// _beginthreadex requires __stdcall
+#define THREADFN unsigned int __stdcall
+#define THREAD_RETURN(val) (unsigned int)((DWORD_PTR)val)
+
+static INLINE int pthread_create(pthread_t* const thread, const void* attr,
+ unsigned int (__stdcall *start)(void*),
+ void* arg) {+ (void)attr;
+ *thread = (pthread_t)_beginthreadex(NULL, /* void *security */
+ 0, /* unsigned stack_size */
+ start,
+ arg,
+ 0, /* unsigned initflag */
+ NULL); /* unsigned *thrdaddr */
+ if (*thread == NULL) return 1;
+ SetThreadPriority(*thread, THREAD_PRIORITY_ABOVE_NORMAL);
+ return 0;
+}
+
+static INLINE int pthread_join(pthread_t thread, void** value_ptr) {+ (void)value_ptr;
+ return (WaitForSingleObject(thread, INFINITE) != WAIT_OBJECT_0 ||
+ CloseHandle(thread) == 0);
+}
+
+// Mutex
+static INLINE int pthread_mutex_init(pthread_mutex_t *const mutex,
+ void* mutexattr) {+ (void)mutexattr;
+ InitializeCriticalSection(mutex);
+ return 0;
+}
+
+static INLINE int pthread_mutex_trylock(pthread_mutex_t *const mutex) {+ return TryEnterCriticalSection(mutex) ? 0 : EBUSY;
+}
+
+static INLINE int pthread_mutex_lock(pthread_mutex_t *const mutex) {+ EnterCriticalSection(mutex);
+ return 0;
+}
+
+static INLINE int pthread_mutex_unlock(pthread_mutex_t *const mutex) {+ LeaveCriticalSection(mutex);
+ return 0;
+}
+
+static INLINE int pthread_mutex_destroy(pthread_mutex_t *const mutex) {+ DeleteCriticalSection(mutex);
+ return 0;
+}
+
+// Condition
+static INLINE int pthread_cond_destroy(pthread_cond_t *const condition) {+ int ok = 1;
+ ok &= (CloseHandle(condition->waiting_sem_) != 0);
+ ok &= (CloseHandle(condition->received_sem_) != 0);
+ ok &= (CloseHandle(condition->signal_event_) != 0);
+ return !ok;
+}
+
+static INLINE int pthread_cond_init(pthread_cond_t *const condition,
+ void* cond_attr) {+ (void)cond_attr;
+ condition->waiting_sem_ = CreateSemaphore(NULL, 0, MAX_DECODE_THREADS, NULL);
+ condition->received_sem_ = CreateSemaphore(NULL, 0, MAX_DECODE_THREADS, NULL);
+ condition->signal_event_ = CreateEvent(NULL, FALSE, FALSE, NULL);
+ if (condition->waiting_sem_ == NULL ||
+ condition->received_sem_ == NULL ||
+ condition->signal_event_ == NULL) {+ pthread_cond_destroy(condition);
+ return 1;
+ }
+ return 0;
+}
+
+static INLINE int pthread_cond_signal(pthread_cond_t *const condition) {+ int ok = 1;
+ if (WaitForSingleObject(condition->waiting_sem_, 0) == WAIT_OBJECT_0) {+ // a thread is waiting in pthread_cond_wait: allow it to be notified
+ ok = SetEvent(condition->signal_event_);
+ // wait until the event is consumed so the signaler cannot consume
+ // the event via its own pthread_cond_wait.
+ ok &= (WaitForSingleObject(condition->received_sem_, INFINITE) !=
+ WAIT_OBJECT_0);
+ }
+ return !ok;
+}
+
+static INLINE int pthread_cond_wait(pthread_cond_t *const condition,
+ pthread_mutex_t *const mutex) {+ int ok;
+ // note that there is a consumer available so the signal isn't dropped in
+ // pthread_cond_signal
+ if (!ReleaseSemaphore(condition->waiting_sem_, 1, NULL))
+ return 1;
+ // now unlock the mutex so pthread_cond_signal may be issued
+ pthread_mutex_unlock(mutex);
+ ok = (WaitForSingleObject(condition->signal_event_, INFINITE) ==
+ WAIT_OBJECT_0);
+ ok &= ReleaseSemaphore(condition->received_sem_, 1, NULL);
+ pthread_mutex_lock(mutex);
+ return !ok;
+}
+#else // _WIN32
+#include <pthread.h> // NOLINT
+# define THREADFN void*
+# define THREAD_RETURN(val) val
+#endif
+
+#endif // CONFIG_MULTITHREAD
+
+// State of the worker thread object
+typedef enum {+ NOT_OK = 0, // object is unusable
+ OK, // ready to work
+ WORK // busy finishing the current task
+} VP9WorkerStatus;
+
+// Function to be called by the worker thread. Takes two opaque pointers as
+// arguments (data1 and data2), and should return false in case of error.
+typedef int (*VP9WorkerHook)(void*, void*);
+
+// Platform-dependent implementation details for the worker.
+typedef struct VP9WorkerImpl VP9WorkerImpl;
+
+// Synchronization object used to launch job in the worker thread
+typedef struct {+ VP9WorkerImpl *impl_;
+ VP9WorkerStatus status_;
+ VP9WorkerHook hook; // hook to call
+ void *data1; // first argument passed to 'hook'
+ void *data2; // second argument passed to 'hook'
+ int had_error; // return value of the last call to 'hook'
+} VP9Worker;
+
+// The interface for all thread-worker related functions. All these functions
+// must be implemented.
+typedef struct {+ // Must be called first, before any other method.
+ void (*init)(VP9Worker *const worker);
+ // Must be called to initialize the object and spawn the thread. Re-entrant.
+ // Will potentially launch the thread. Returns false in case of error.
+ int (*reset)(VP9Worker *const worker);
+ // Makes sure the previous work is finished. Returns true if worker->had_error
+ // was not set and no error condition was triggered by the working thread.
+ int (*sync)(VP9Worker *const worker);
+ // Triggers the thread to call hook() with data1 and data2 arguments. These
+ // hook/data1/data2 values can be changed at any time before calling this
+ // function, but not be changed afterward until the next call to Sync().
+ void (*launch)(VP9Worker *const worker);
+ // This function is similar to launch() except that it calls the
+ // hook directly instead of using a thread. Convenient to bypass the thread
+ // mechanism while still using the VP9Worker structs. sync() must
+ // still be called afterward (for error reporting).
+ void (*execute)(VP9Worker *const worker);
+ // Kill the thread and terminate the object. To use the object again, one
+ // must call reset() again.
+ void (*end)(VP9Worker *const worker);
+} VP9WorkerInterface;
+
+// Install a new set of threading functions, overriding the defaults. This
+// should be done before any workers are started, i.e., before any encoding or
+// decoding takes place. The contents of the interface struct are copied, it
+// is safe to free the corresponding memory after this call. This function is
+// not thread-safe. Return false in case of invalid pointer or methods.
+int vp9_set_worker_interface(const VP9WorkerInterface *const winterface);
+
+// Retrieve the currently set thread worker interface.
+const VP9WorkerInterface *vp9_get_worker_interface(void);
+
+//------------------------------------------------------------------------------
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // VP9_DECODER_VP9_THREAD_H_
--- /dev/null
+++ b/vpx_thread/vpx_thread.mk
@@ -1,0 +1,13 @@
+##
+## Copyright (c) 2015 The WebM project authors. All Rights Reserved.
+##
+## Use of this source code is governed by a BSD-style license
+## that can be found in the LICENSE file in the root of the source
+## tree. An additional intellectual property rights grant can be found
+## in the file PATENTS. All contributing project authors may
+## be found in the AUTHORS file in the root of the source tree.
+##
+
+THREAD_SRCS-yes += vpx_thread.mk
+THREAD_SRCS-yes += vpx_thread.c
+THREAD_SRCS-yes += vpx_thread.h