void CRWMutex::lockRead()
{
#ifndef ANDROID
pthread_rwlock_rdlock(&mMutex);
#else
reader_lock(&mMutex);
#endif //ANDROID
}
/* READER THREAD reads from shared memory and does some busy work */
void *Reader( void * num)
{
time_t now;
int i;
pid_t tid;
tid = syscall(SYS_gettid);
time(&now); /* grabs system time and stuff it into struct time_t now*/
if (DEBUG)
fprintf(stderr,"create reader thread pid: %d tid: %d %s\n",getpid(), tid,
ctime(&now));
fib(5); /* do some busy work */
/* reader thread simply reads three times */
for (i=1; i<= 3; i++){
fib(24); /* do some busy work */
int n_writers_waiting = semctl(semid, READER, GETZCNT);
if(!n_writers_waiting)
{
reader_lock(semid);
//if(!n_writers_waiting)
//{
/* construct a string for the reader to spit out */
fib(30);
char str[5];
char buf[80] = "reader ";
strcat(buf,(char*)num);
strcat(buf," reads: ");
/* grab shared mem and display it */
sprintf(str,"%d",*shared);
strcat(buf, str);
strcat(buf, "\n");
write(1,buf,strlen(buf));
fsync(1);
reader_unlock(semid);
}
}
pthread_exit(0);
}
/* Reader function reads from shared memory */
void *Reader( void * num)
{
int i;
pid_t tid;
tid = syscall(SYS_gettid);
printf("create reader thread pid: %d tid: %d \n",getpid(), tid);
/* should make loop random when you have multiple threads-fixed at 3 now */
for (i=1; i<= 3; i++){
int zsems = semctl(semid, WRITER, GETZCNT);
if(zsems > 0){
reader_lock( semid );
fib(20);
printf("reader #%s %s", (char *)num, mem_ptr);
reader_unlock( semid );
}
}
pthread_exit(0);
}
hsa_status_t Validate(uint32_t *result) {
amd::hsa::common::ReaderLockGuard<amd::hsa::common::ReaderWriterLock> reader_lock(rw_lock_);
assert(result);
*result = 0;
return HSA_STATUS_SUCCESS;
}
