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- attempt to fix network stuttering using a new multi-read single write mutex + semaphore class

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This commit is contained in:
Mark Vejvoda
2011-11-26 08:14:23 +00:00
parent b8d71ffb0d
commit 6c1c248d62
8 changed files with 390 additions and 85 deletions
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49
source/shared_lib/sources/platform/sdl/thread.cpp
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@@ -210,14 +210,59 @@ void Semaphore::signal() {
SDL_SemPost(semaphore);
}
int Semaphore::waitTillSignalled() {
int Semaphore::waitTillSignalled(int waitMilliseconds) {
if(semaphore == NULL) {
char szBuf[1024]="";
snprintf(szBuf,1023,"In [%s::%s Line: %d] semaphore == NULL",__FILE__,__FUNCTION__,__LINE__);
throw runtime_error(szBuf);
}
int semValue = SDL_SemWait(semaphore);
int semValue = 0;
if(waitMilliseconds >= 0) {
semValue = SDL_SemWaitTimeout(semaphore,waitMilliseconds);
}
else {
semValue = SDL_SemWait(semaphore);
}
return semValue;
}
uint32 Semaphore::getSemValue() {
if(semaphore == NULL) {
char szBuf[1024]="";
snprintf(szBuf,1023,"In [%s::%s Line: %d] semaphore == NULL",__FILE__,__FUNCTION__,__LINE__);
throw runtime_error(szBuf);
}
return SDL_SemValue(semaphore);
}
ReadWriteMutex::ReadWriteMutex(int maxReaders) : semaphore(maxReaders) {
this->maxReadersCount = maxReaders;
}
void ReadWriteMutex::LockRead() {
semaphore.waitTillSignalled();
}
void ReadWriteMutex::UnLockRead() {
semaphore.signal();
}
void ReadWriteMutex::LockWrite() {
MutexSafeWrapper safeMutex(&mutex);
uint32 totalLocks = maxReaders();
for (int i = 0; i < totalLocks; ++i) {
semaphore.waitTillSignalled();
}
}
void ReadWriteMutex::UnLockWrite() {
uint32 totalLocks = maxReaders();
for (int i = 0; i < totalLocks; ++i) {
semaphore.signal();
}
}
int ReadWriteMutex::maxReaders() {
//return semaphore.getSemValue();
return this->maxReadersCount;
}
}}//end namespace