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正文

#include <assert.h>
#include <string.h>   // for memset()
#include "./thread.h"
#include "./utils.h"

#ifdef WEBP_USE_THREAD

#if defined(_WIN32)

#include <windows.h>
typedef HANDLE pthread_t;
typedef CRITICAL_SECTION pthread_mutex_t;
typedef struct {
  HANDLE waiting_sem_;
  HANDLE received_sem_;
  HANDLE signal_event_;
} pthread_cond_t;

#else  // !_WIN32

#include <pthread.h>

#endif  // _WIN32

struct WebPWorkerImpl {
  pthread_mutex_t mutex_;
  pthread_cond_t  condition_;
  pthread_t       thread_;
};

#if defined(_WIN32)

//------------------------------------------------------------------------------
// simplistic pthread emulation layer

#include <process.h>

// _beginthreadex requires __stdcall
#define THREADFN unsigned int __stdcall
#define THREAD_RETURN(val) (unsigned int)((DWORD_PTR)val)

static 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 int pthread_join(pthread_t thread, void** value_ptr) {
  (void)value_ptr;
  return (WaitForSingleObject(thread, INFINITE) != WAIT_OBJECT_0 ||
          CloseHandle(thread) == 0);
}

// Mutex
static int pthread_mutex_init(pthread_mutex_t* const mutex, void* mutexattr) {
  (void)mutexattr;
  InitializeCriticalSection(mutex);
  return 0;
}

static int pthread_mutex_lock(pthread_mutex_t* const mutex) {
  EnterCriticalSection(mutex);
  return 0;
}

static int pthread_mutex_unlock(pthread_mutex_t* const mutex) {
  LeaveCriticalSection(mutex);
  return 0;
}

static int pthread_mutex_destroy(pthread_mutex_t* const mutex) {
  DeleteCriticalSection(mutex);
  return 0;
}

// Condition
static 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 int pthread_cond_init(pthread_cond_t* const condition, void* cond_attr) {
  (void)cond_attr;
  condition->waiting_sem_ = CreateSemaphore(NULL, 0, 1, NULL);
  condition->received_sem_ = CreateSemaphore(NULL, 0, 1, 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 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 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
# define THREADFN void*
# define THREAD_RETURN(val) val
#endif  // _WIN32

//------------------------------------------------------------------------------

static void Execute(WebPWorker* const worker);  // Forward declaration.

static THREADFN ThreadLoop(void* ptr) {
  WebPWorker* const worker = (WebPWorker*)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 ChangeState(WebPWorker* const worker,
                        WebPWorkerStatus 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_);
    }
  }
![](https://img-blog.csdnimg.cn/img_convert/9a8cb5f8c0ec69e6499adead0da6e95b.png)



最全的Linux教程，Linux从入门到精通

======================

1.  **linux从入门到精通(第2版)**

2.  **Linux系统移植**

3.  **Linux驱动开发入门与实战**

4.  **LINUX 系统移植 第2版**

5.  **Linux开源网络全栈详解 从DPDK到OpenFlow**



![华为18级工程师呕心沥血撰写3000页Linux学习笔记教程](https://img-blog.csdnimg.cn/img_convert/59742364bb1338737fe2d315a9e2ec54.png)



第一份《Linux从入门到精通》466页

====================

内容简介

====

本书是获得了很多读者好评的Linux经典畅销书**《Linux从入门到精通》的第2版**。本书第1版出版后曾经多次印刷，并被51CTO读书频道评为“最受读者喜爱的原创IT技术图书奖”。本书第﹖版以最新的Ubuntu 12.04为版本，循序渐进地向读者介绍了Linux 的基础应用、系统管理、网络应用、娱乐和办公、程序开发、服务器配置、系统安全等。本书附带1张光盘，内容为本书配套多媒体教学视频。另外,本书还为读者提供了大量的Linux学习资料和Ubuntu安装镜像文件，供读者免费下载。



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**本书适合广大Linux初中级用户、开源软件爱好者和大专院校的学生阅读，同时也非常适合准备从事Linux平台开发的各类人员。**

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![img](https://img-blog.csdnimg.cn/img_convert/ee2bf0009772d4feb66fc8fe2b3459f9.jpeg)

**一个人可以走的很快，但一群人才能走的更远！不论你是正从事IT行业的老鸟或是对IT行业感兴趣的新人，都欢迎加入我们的的圈子（技术交流、学习资源、职场吐槽、大厂内推、面试辅导），让我们一起学习成长！**



**网上学习资料一大堆，但如果学到的知识不成体系，遇到问题时只是浅尝辄止，不再深入研究，那么很难做到真正的技术提升。**

**需要这份系统化的资料的朋友，可以添加V获取：vip1024b （备注运维）**
[外链图片转存中...(img-e5ftGecF-1713188270830)]

**一个人可以走的很快，但一群人才能走的更远！不论你是正从事IT行业的老鸟或是对IT行业感兴趣的新人，都欢迎加入我们的的圈子（技术交流、学习资源、职场吐槽、大厂内推、面试辅导），让我们一起学习成长！**