/
fast_mutex.h
177 lines (177 loc) · 3.92 KB
/
fast_mutex.h
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#ifndef _FAST_MUTEX_H_
#define _FAST_MUTEX_H_
#if !defined(_TTHREAD_PLATFORM_DEFINED_)
#if defined(_WIN32) || defined(__WIN32__) || defined(__WINDOWS__)
#define _TTHREAD_WIN32_
#else
#define _TTHREAD_POSIX_
#endif
#define _TTHREAD_PLATFORM_DEFINED_
#endif
#if (defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))) || \
(defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))) || \
(defined(__GNUC__) && (defined(__ppc__)))
#define _FAST_MUTEX_ASM_
#else
#define _FAST_MUTEX_SYS_
#endif
#if defined(_TTHREAD_WIN32_)
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#define __UNDEF_LEAN_AND_MEAN
#endif
#include <windows.h>
#ifdef __UNDEF_LEAN_AND_MEAN
#undef WIN32_LEAN_AND_MEAN
#undef __UNDEF_LEAN_AND_MEAN
#endif
#else
#ifdef _FAST_MUTEX_ASM_
#include <sched.h>
#else
#include <pthread.h>
#endif
#endif
namespace tthread
{
class fast_mutex
{
public:
#if defined(_FAST_MUTEX_ASM_)
fast_mutex() : mLock(0)
{
}
#else
fast_mutex()
{
#if defined(_TTHREAD_WIN32_)
InitializeCriticalSection(&mHandle);
#elif defined(_TTHREAD_POSIX_)
pthread_mutex_init(&mHandle, NULL);
#endif
}
#endif
#if !defined(_FAST_MUTEX_ASM_)
~fast_mutex()
{
#if defined(_TTHREAD_WIN32_)
DeleteCriticalSection(&mHandle);
#elif defined(_TTHREAD_POSIX_)
pthread_mutex_destroy(&mHandle);
#endif
}
#endif
inline void lock()
{
#if defined(_FAST_MUTEX_ASM_)
bool gotLock;
do
{
gotLock = try_lock();
if (!gotLock)
{
#if defined(_TTHREAD_WIN32_)
Sleep(0);
#elif defined(_TTHREAD_POSIX_)
sched_yield();
#endif
}
} while (!gotLock);
#else
#if defined(_TTHREAD_WIN32_)
EnterCriticalSection(&mHandle);
#elif defined(_TTHREAD_POSIX_)
pthread_mutex_lock(&mHandle);
#endif
#endif
}
inline bool try_lock()
{
#if defined(_FAST_MUTEX_ASM_)
int oldLock;
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
asm volatile(
"movl $1,%%eax\n\t"
"xchg %%eax,%0\n\t"
"movl %%eax,%1\n\t"
: "=m"(mLock), "=m"(oldLock)
:
: "%eax", "memory");
#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
int *ptrLock = &mLock;
__asm {
mov eax,1
mov ecx,ptrLock
xchg eax,[ecx]
mov oldLock,eax
}
#elif defined(__GNUC__) && (defined(__ppc__))
int newLock = 1;
asm volatile(
"\n1:\n\t"
"lwarx %0,0,%1\n\t"
"cmpwi 0,%0,0\n\t"
"bne- 2f\n\t"
"stwcx. %2,0,%1\n\t"
"bne- 1b\n\t"
"isync\n"
"2:\n\t"
: "=&r"(oldLock)
: "r"(&mLock), "r"(newLock)
: "cr0", "memory");
#endif
return (oldLock == 0);
#else
#if defined(_TTHREAD_WIN32_)
return TryEnterCriticalSection(&mHandle) ? true : false;
#elif defined(_TTHREAD_POSIX_)
return (pthread_mutex_trylock(&mHandle) == 0) ? true : false;
#endif
#endif
}
inline void unlock()
{
#if defined(_FAST_MUTEX_ASM_)
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
asm volatile(
"movl $0,%%eax\n\t"
"xchg %%eax,%0\n\t"
: "=m"(mLock)
:
: "%eax", "memory");
#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
int *ptrLock = &mLock;
__asm {
mov eax,0
mov ecx,ptrLock
xchg eax,[ecx]
}
#elif defined(__GNUC__) && (defined(__ppc__))
asm volatile(
"sync\n\t"
:
:
: "memory");
mLock = 0;
#endif
#else
#if defined(_TTHREAD_WIN32_)
LeaveCriticalSection(&mHandle);
#elif defined(_TTHREAD_POSIX_)
pthread_mutex_unlock(&mHandle);
#endif
#endif
}
private:
#if defined(_FAST_MUTEX_ASM_)
int mLock;
#else
#if defined(_TTHREAD_WIN32_)
CRITICAL_SECTION mHandle;
#elif defined(_TTHREAD_POSIX_)
pthread_mutex_t mHandle;
#endif
#endif
};
}
#endif