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Semaphore.h
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Semaphore.h
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#pragma once
#include "SharedMemory.h"
#include <string.h>
#ifdef _WIN32
#include <windows.h>
#include <tlhelp32.h>
#define TIMEOUT_VARIABLE iRet
#define SEM_FAILED 0
#define sem_open(name, oflag, accessPermission, initValue) CreateSemaphoreA(CreateSecurityDescriptor(accessPermission), initValue, 1, name)
#define TimeWait(semaphore, timeout) WaitForSingleObject(semaphore, timeout)
#define sem_wait(semaphore) WaitForSingleObject(semaphore, INFINITE)
#define sem_post(semaphore) (!ReleaseSemaphore(semaphore, 1, NULL))
#define sem_close(semaphore) CloseHandle(semaphore)
static bool QueryThreadExist(DWORD ThreadID)
{
if (0 == ThreadID)return false;
HANDLE h_Process = OpenThread(THREAD_QUERY_INFORMATION, FALSE, ThreadID);
if (!h_Process)
{
DWORD error = GetLastError();
if (error == ERROR_SUCCESS || ERROR_ACCESS_DENIED == error)
{
//LOG_DEBUG("Thread exist\r\n");
return true;
}
else
{
//LOG_DEBUG("Thread does not exist, error:%d\r\n", error);
return false;
}
}
DWORD dwExitCode = 0;
BOOL ret = GetExitCodeThread(h_Process, &dwExitCode);
CloseHandle(h_Process);
if (0 == ret || (0 != ret && STILL_ACTIVE != dwExitCode))
return false;
return true;
}
#else
#include <stdio.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/syscall.h>
#define GetCurrentThreadId() syscall(__NR_gettid)
#define WAIT_OBJECT_0 0
#define WAIT_FAILED -1
#define WAIT_TIMEOUT ETIMEDOUT
#define TIMEOUT_VARIABLE errno
static int TimeWait(sem_t *semaphore, unsigned long timeoutMilliseconds)
{
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_nsec += timeoutMilliseconds % 1000 * 1000000;
ts.tv_sec += timeoutMilliseconds / 1000 + ts.tv_nsec/1000000000;
ts.tv_nsec %= 1000000000;
return sem_timedwait(semaphore, &ts);
}
static bool QueryThreadExist(int ThreadID)
{
if (0 == ThreadID)return false;
char buf[MAX_SHARED_MEMORY_NAME_SIZE] = { 0 };
sprintf(buf, "/proc/%d/exe", ThreadID);
FILE *fp = fopen(buf, "r");
if (fp)
{
//LOG_DEBUG("Thread exist\r\n");
fclose(fp);
return true;
}
else
{
//LOG_DEBUG("Thread does not exist, error:%d\r\n", error);
return false;
}
}
#endif
class CSemaphore
{
public:
CSemaphore(const unsigned int key, const unsigned int initValue = 1, const unsigned int accessPermission = 0666);
//CSemaphore(const char* nameSem, const unsigned int initValue = 1, const unsigned int accessPermission = 0666);
virtual ~CSemaphore();
virtual int Wait(unsigned long timeoutMilliseconds = (unsigned long)-1);
virtual int Post();
private:
static const int INTERVAL_TIMEOUT = 1000; //ºÁÃë
sem_t *m_sem;
unsigned int *m_pThreadIDSharedMemory;
};
inline CSemaphore::CSemaphore(const unsigned int key, const unsigned int initValue, const unsigned int accessPermission)
{
m_pThreadIDSharedMemory = NULL;
m_sem = NULL;
char nameSem[MAX_SHARED_MEMORY_NAME_SIZE] = { 0 };
sprintf(nameSem, "Global\\Semaphore_%u", key);
m_sem = sem_open(nameSem, O_CREAT, accessPermission, initValue);
if (SEM_FAILED == m_sem)
{
LOG_ERROR("Semaphore application failed, key=%u, error=%s\r\n", key, GetErrorStr(ERRNO));
exit(ERRNO);
}
#ifdef __linux__
sprintf(nameSem, "/dev/shm/sem.Global\\Semaphore_%u", key);
chmod(nameSem, accessPermission);
#endif
CSharedMemory sharedMemory(key, sizeof(int), accessPermission);
m_pThreadIDSharedMemory = (unsigned int*)sharedMemory.Begin();
}
//CSemaphore::CSemaphore(const char* nameSem, const unsigned int initValue, const unsigned int accessPermission)
//{
// m_sem = sem_open(nameSem, O_CREAT, accessPermission, initValue);
// if (SEM_FAILED == m_sem)
// {
// LOG_ERROR("Semaphore application failed\r\n");
// exit(-2);
// }
//}
inline CSemaphore::~CSemaphore()
{
#ifdef SHARED_MEMORY_CLEAR
if (NULL != m_sem)
sem_close(m_sem);
#endif
}
inline int CSemaphore::Wait(unsigned long timeoutMilliseconds)
{
int iRet = WAIT_OBJECT_0;
unsigned long uInterval = 0;
while (NULL == m_pThreadIDSharedMemory)Sleep(1);
while(1)
{
if (timeoutMilliseconds == (unsigned long)-1)
{
uInterval = INTERVAL_TIMEOUT;
}
else if (timeoutMilliseconds > INTERVAL_TIMEOUT)
{
timeoutMilliseconds -= INTERVAL_TIMEOUT;
uInterval = INTERVAL_TIMEOUT;
}
else
{
uInterval = timeoutMilliseconds;
timeoutMilliseconds = 0;
}
iRet = TimeWait(m_sem, uInterval);
if (iRet == WAIT_OBJECT_0)
{
*m_pThreadIDSharedMemory = GetCurrentThreadId();
return WAIT_OBJECT_0;
}
switch (TIMEOUT_VARIABLE)
{
case WAIT_TIMEOUT:
if (*m_pThreadIDSharedMemory == GetCurrentThreadId())
{
if (0 == timeoutMilliseconds)
return WAIT_TIMEOUT;
else
continue;
}
if (!QueryThreadExist(*m_pThreadIDSharedMemory))
{
*m_pThreadIDSharedMemory = GetCurrentThreadId();
Sleep(1);
if (*m_pThreadIDSharedMemory == GetCurrentThreadId())
{
LOG_DEBUG("The semaphore is abnormally locked and unlocked.\r\n");
return WAIT_OBJECT_0;
}
}
if (0 == timeoutMilliseconds)
return WAIT_TIMEOUT;
break;
case WAIT_FAILED:
LOG_ERROR("Semaphore WAIT_FAILED error, error=%s\r\n", GetErrorStr(ERRNO));
return TIMEOUT_VARIABLE;
default:
LOG_ERROR("Semaphore other error, error=%s\r\n", GetErrorStr(ERRNO));
return TIMEOUT_VARIABLE;
}
}
}
inline int CSemaphore::Post()
{
if (NULL == m_sem)
return 0;
#ifdef _WIN32
sem_post(m_sem);
return 0;
#else
int iRet = sem_post(m_sem);
if (iRet == WAIT_OBJECT_0)return WAIT_OBJECT_0;
LOG_ERROR("Semaphore error, error=%s\r\n", GetErrorStr(ERRNO));
return ERRNO;
#endif
}