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#include "mutex.h"
#include <util/generic/yexception.h>
#include <errno.h>
#if defined(_win_)
#include "winint.h"
#else
#include <pthread.h>
#endif
class TMutex::TImpl {
public:
inline TImpl() {
#if defined(_win_)
InitializeCriticalSection(&Obj);
#else
struct T {
pthread_mutexattr_t Attr;
inline T() {
int result;
memset(&Attr, 0, sizeof(Attr));
result = pthread_mutexattr_init(&Attr);
if (result != 0) {
ythrow yexception() << "mutexattr init failed(" << LastSystemErrorText(result) << ")";
}
result = pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
if (result != 0) {
ythrow yexception() << "mutexattr set type failed(" << LastSystemErrorText(result) << ")";
}
}
inline ~T() {
int result = pthread_mutexattr_destroy(&Attr);
Y_ABORT_UNLESS(result == 0, "mutexattr destroy(%s)", LastSystemErrorText(result));
}
} pma;
int result = pthread_mutex_init(&Obj, &pma.Attr);
if (result != 0) {
ythrow yexception() << "mutex init failed(" << LastSystemErrorText(result) << ")";
}
#endif
}
inline ~TImpl() {
#if defined(_win_)
DeleteCriticalSection(&Obj);
#else
int result = pthread_mutex_destroy(&Obj);
Y_ABORT_UNLESS(result == 0, "mutex destroy failure (%s)", LastSystemErrorText(result));
#endif
}
inline void Acquire() noexcept {
#if defined(_win_)
EnterCriticalSection(&Obj);
#else
int result = pthread_mutex_lock(&Obj);
Y_ABORT_UNLESS(result == 0, "mutex lock failure (%s)", LastSystemErrorText(result));
#endif
}
#if defined(_win_)
static bool TryEnterCriticalSectionInt(CRITICAL_SECTION* obj) {
#if (_WIN32_WINNT < 0x0400)
if (-1L == ::InterlockedCompareExchange(&obj->LockCount, 0, -1)) {
obj->OwningThread = (HANDLE)(DWORD_PTR)::GetCurrentThreadId();
obj->RecursionCount = 1;
return true;
}
if (obj->OwningThread == (HANDLE)(DWORD_PTR)::GetCurrentThreadId()) {
::InterlockedIncrement(&obj->LockCount);
++obj->RecursionCount;
return true;
}
return false;
#else // _WIN32_WINNT < 0x0400
return TryEnterCriticalSection(obj);
#endif // _WIN32_WINNT < 0x0400
}
#endif // _win_
inline bool TryAcquire() noexcept {
#if defined(_win_)
return TryEnterCriticalSectionInt(&Obj);
#else
int result = pthread_mutex_trylock(&Obj);
if (result == 0 || result == EBUSY) {
return result == 0;
}
Y_FAIL("mutex trylock failure (%s)", LastSystemErrorText(result));
#endif
}
inline void Release() noexcept {
#if defined(_win_)
LeaveCriticalSection(&Obj);
#else
int result = pthread_mutex_unlock(&Obj);
Y_ABORT_UNLESS(result == 0, "mutex unlock failure (%s)", LastSystemErrorText(result));
#endif
}
inline void* Handle() const noexcept {
return (void*)&Obj;
}
private:
#ifdef _win_
CRITICAL_SECTION Obj;
#else
pthread_mutex_t Obj;
#endif
};
TMutex::TMutex()
: Impl_(new TImpl())
{
}
TMutex::TMutex(TMutex&&) noexcept = default;
TMutex::~TMutex() = default;
void TMutex::Acquire() noexcept {
Impl_->Acquire();
}
bool TMutex::TryAcquire() noexcept {
return Impl_->TryAcquire();
}
void TMutex::Release() noexcept {
Impl_->Release();
}
void* TMutex::Handle() const noexcept {
return Impl_->Handle();
}
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