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#include "stdafx.h"
#include "Lock.h"
namespace util {
#ifdef WINDOWS
// Default spin count. This is what the heap manager uses internally according to MSDN. We
// typically have fairly short critical sections here, so this should work well for us as well.
static const DWORD spinCount = 4000;
Lock::Lock() {
InitializeCriticalSectionAndSpinCount(&cs, spinCount);
}
Lock::~Lock() {
DeleteCriticalSection(&cs);
}
Lock::L::L(Lock &l) : l(&l) {
EnterCriticalSection(&l.cs);
}
Lock::L::L(Lock *l) : l(l) {
if (l)
EnterCriticalSection(&l->cs);
}
Lock::L::~L() {
if (l)
LeaveCriticalSection(&l->cs);
}
void Lock::lock() {
EnterCriticalSection(&cs);
}
void Lock::unlock() {
LeaveCriticalSection(&cs);
}
#endif
#ifdef POSIX
Lock::Lock() {
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&cs, &attr);
pthread_mutexattr_destroy(&attr);
}
Lock::~Lock() {
pthread_mutex_destroy(&cs);
}
Lock::L::L(Lock &l) : l(&l) {
// According to the man pages, we do not need to consider EINTR from locking a mutex.
pthread_mutex_lock(&l.cs);
}
Lock::L::L(Lock *l) : l(l) {
// According to the man pages, we do not need to consider EINTR from locking a mutex.
if (l)
pthread_mutex_lock(&l->cs);
}
Lock::L::~L() {
if (l)
pthread_mutex_unlock(&l->cs);
}
void Lock::lock() {
pthread_mutex_lock(&cs);
}
void Lock::unlock() {
pthread_mutex_unlock(&cs);
}
#endif
}
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