Multi-tasking
Posted: Sun Aug 29, 2004 5:54 pm
Hi again,
I'm having a problem with threads.
What I am doing is creating and starting a thread from main() that
will call a routine which in turn will create and start another thread.
The first thread from main() will run a function that will open and buffer a sound file. When the buffer is full, this function starts a new thread that plays the buffer and then it gets back to work refilling the buffer. Everything works fine except in my main function. After I start the thread, the main() will continue to run until it eventually ends, which is normal, I don't want it to end however so I've placed a busy-waiting loop after starting the thread. This works, but it seems that whenever my thread read a sound file to buffer, it makes some incorrect reads.
Next, I tried placing a SleepThread or WaitSema after starting the thread. This works great. After the thread is done, I call WakeupThread and give it the ID of the main routine. Even though I called wakeupthread() at the end of my thread function, it crashes. The ps2 throws and exception at me.
My goal is to be able to stream a sound file while using the controller to browse other sound files on the HDD.
Anyway here is some code from my main(), maybe someone knows an alternative method i could use.
I'm having a problem with threads.
What I am doing is creating and starting a thread from main() that
will call a routine which in turn will create and start another thread.
The first thread from main() will run a function that will open and buffer a sound file. When the buffer is full, this function starts a new thread that plays the buffer and then it gets back to work refilling the buffer. Everything works fine except in my main function. After I start the thread, the main() will continue to run until it eventually ends, which is normal, I don't want it to end however so I've placed a busy-waiting loop after starting the thread. This works, but it seems that whenever my thread read a sound file to buffer, it makes some incorrect reads.
Next, I tried placing a SleepThread or WaitSema after starting the thread. This works great. After the thread is done, I call WakeupThread and give it the ID of the main routine. Even though I called wakeupthread() at the end of my thread function, it crashes. The ps2 throws and exception at me.
My goal is to be able to stream a sound file while using the controller to browse other sound files on the HDD.
Anyway here is some code from my main(), maybe someone knows an alternative method i could use.
Code: Select all
int main()
{
int pid=-1;
int t=0;
t_hddInfo hddInfo;
int iFile;
struct WAV decoder;
SifInitRpc(0);
init_scr();
hddPreparePoweroff();
hddInit();
hddSetUserPoweroffCallback((void *)poweroffHandler,(void *)pid);
ret = sbv_patch_enable_lmb();
ret = sbv_patch_disable_prefix_check();
rmallocInit();
if (OpenPartition("hdd0:+WAV") < 0)
return -1;
SjPCM_Init(0);
SjPCM_Clearbuff();
SjPCM_Setvol(0x3fff);
CreateDecoder("voice.wav", 8, &decoder); //This sets up the thread with priority 8
StartDecoder(&decoder); //StartThread();
SleepThread();
ClosePartition();
scr_printf("Finished.\n");
SifInitRpc(0);
return 0;
}
int CreateDecoder(char *filename, int priority, struct WAV *decode)
{
decode->thread.func = (void *)RunDecoder;
decode->thread.stack = decode->decoderThreadStack;
decode->thread.stack_size = sizeof(decode->decoderThreadStack);
decode->thread.gp_reg = &_gp;
decode->thread.initial_priority = priority;
decode->pid = CreateThread(&decode->thread);
strcpy(decode->fileName, filename);
decode->parent = GetThreadId();
decode->flag = 1;
decode->sema.init_count = 0;
decode->sema.max_count = 1;
decode->sema.option = 0;
decode->Semaphore = CreateSema(&decode->sema);
return decode->pid;
}
void RunDecoder(void *arg) //this is the threaded function
{
struct WAV *decode = (struct WAV *)arg;
printf("opening...\n");
decode->iFile = fileXioOpen(decode->fileName, O_RDONLY, 0);
printf("opened %d\n", decode->iFile);
WAVAudioDecoder(decode->iFile); //This buffers and calls the SjPCM thread. This function does not end until the sound is done.
decode->flag = 2;
WakeupThread(decode->parent); //Wakes up main()
printf("RunDecoder Done\n"); //Crashes after function exits.
}