csdr/tsmpool.cpp

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#include "tsmpool.h"
tsmpool::tsmpool(size_t size, int num) :
size(size),
num(num) //number of buffers of (size) to alloc
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{
this->threads_cntr = 0;
this->ok = 1;
this->lowest_read_index = -1;
this->write_index = 0;
this->my_read_index = index_before(0);
if (pthread_mutex_init(&this->mutex, NULL) != 0) { this->ok = 0; return; }
for(int i=0; i<num; i++)
{
void* newptr = (void*)new char[size];
if(!newptr) { this->ok = 0; return; }
buffers.push_back(newptr);
}
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}
int tsmpool::is_ok() { return this->ok; }
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void* tsmpool::get_write_buffer()
{
//if(write_index==index_before(lowest_read_index)) return NULL;
pthread_mutex_lock(&this->mutex);
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void* to_return = buffers[write_index];
write_index = index_next(write_index);
pthread_mutex_unlock(&this->mutex);
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if(TSM_DEBUG) fprintf(stderr, "gwb: write_index = %d\n", write_index);
return to_return;
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}
tsmthread_t* tsmpool::register_thread()
{
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if(!ok) return NULL;
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pthread_mutex_lock(&this->mutex);
tsmthread_t* thread = new tsmthread_t();
thread->read_index = index_before(write_index);
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threads.push_back(thread);
pthread_mutex_unlock(&this->mutex);
return thread;
}
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void tsmpool::remove_thread(tsmthread_t* thread)
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{
pthread_mutex_lock(&this->mutex);
for(int i=0;i<threads.size();i++)
if(threads[i] == thread)
{
delete threads[i];
threads.erase(threads.begin()+i);
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break;
}
pthread_mutex_unlock(&this->mutex);
}
void* tsmpool::get_read_buffer(tsmthread_t* thread)
{
pthread_mutex_lock(&this->mutex);
int* actual_read_index = (thread==NULL) ? &my_read_index : &thread->read_index;
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if(*actual_read_index==index_before(write_index))
{
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if(TSM_DEBUG) fprintf(stderr, "grb: fail,"
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"read_index %d is just before write_index\n", *actual_read_index);
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pthread_mutex_unlock(&this->mutex);
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return NULL;
}
void* to_return = buffers[*actual_read_index];
*actual_read_index=index_next(*actual_read_index);
pthread_mutex_unlock(&this->mutex);
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if(TSM_DEBUG) fprintf(stderr, "grb: read_index = %d\n", *actual_read_index);
return to_return;
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}