#include <c_Mutex.h>

c_err_t c_Mutex_Init(c_Mutex_t* mutex) {
    if (!mutex) return C_ERR_FAIL;

#if defined(PLATFORM_WINDOWS)
    // InitializeCriticalSection 不会失败，但 InitializeCriticalSectionAndSpinCount 可能会
    // 工业级推荐直接使用此 API，性能优秀
    InitializeCriticalSection(&mutex->handle);
    mutex->is_initialized = C_TRUE;
    return C_ERR_SUCCESS;
#elif defined(PLATFORM_POSIX)
    // POSIX 默认是 PTHREAD_MUTEX_DEFAULT (不可重入锁)
    if (pthread_mutex_init(&mutex->handle, NULL) == 0) {
        mutex->is_initialized = C_TRUE;
        return C_ERR_SUCCESS;
    }
    return C_ERR_FAIL;
#endif
}

void c_Mutex_Destroy(c_Mutex_t* mutex) {
    if (!mutex || !mutex->is_initialized) return;

#if defined(PLATFORM_WINDOWS)
    DeleteCriticalSection(&mutex->handle);
#elif defined(PLATFORM_POSIX)
    pthread_mutex_destroy(&mutex->handle);
#endif
    mutex->is_initialized = C_FALSE;
}


void c_Mutex_Lock(c_Mutex_t* mutex) {
    if (!mutex || !mutex->is_initialized) return;
#if defined(PLATFORM_WINDOWS)
    EnterCriticalSection(&mutex->handle);
#elif defined(PLATFORM_POSIX)
    pthread_mutex_lock(&mutex->handle);
#endif
}

c_bool_t c_Mutex_TryLock(c_Mutex_t* mutex) {
    if (!mutex || !mutex->is_initialized) return C_FALSE;

#if defined(PLATFORM_WINDOWS)
    // TryEnterCriticalSection 返回非 0 表示成功
    return (TryEnterCriticalSection(&mutex->handle) != 0)?C_TRUE:C_FALSE;
#elif defined(PLATFORM_POSIX)
    // pthread_mutex_trylock 返回 0 表示成功
    return (pthread_mutex_trylock(&mutex->handle) == 0)?C_TRUE:C_FALSE;
#endif
}


void c_Mutex_UnLock(c_Mutex_t* mutex) {
    if (!mutex || !mutex->is_initialized) return;
#if defined(PLATFORM_WINDOWS)
    LeaveCriticalSection(&mutex->handle);
#elif defined(PLATFORM_POSIX)
    pthread_mutex_unlock(&mutex->handle);
#endif
}