An open and free bittorrent tracker https://erdgeist.org/gitweb/opentracker
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 

77 lines
2.0 KiB

/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
It is considered beerware. Prost. Skol. Cheers or whatever. */
#include <pthread.h>
#include <stdio.h>
#include "trackerlogic.h"
#include "mutex.h"
static int bucket_locklist[ OT_MAX_THREADS ];
static int bucket_locklist_count = 0;
static pthread_mutex_t bucket_mutex;
static pthread_cond_t bucket_being_unlocked;
static int bucket_check( int bucket ) {
/* C should come with auto-i ;) */
int i;
/* No more space to acquire lock to bucket -- should not happen */
if( bucket_locklist_count == OT_MAX_THREADS ) {
fprintf( stderr, "More lock requests than mutexes. Consult source code.\n" );
return -1;
}
/* See, if bucket is already locked */
for( i=0; i<bucket_locklist_count; ++i )
if( bucket_locklist[ i ] == bucket )
return -1;
return 0;
}
static void bucket_push( int bucket ) {
bucket_locklist[ bucket_locklist_count++ ] = bucket;
}
static void bucket_remove( int bucket ) {
int i = 0;
while( ( i < bucket_locklist_count ) && ( bucket_locklist[ i ] != bucket ) )
++i;
if( i == bucket_locklist_count ) {
fprintf( stderr, "Request to unlock bucket that was never lock. Consult source code.\n" );
return;
}
for( ; i < bucket_locklist_count - 1; ++i )
bucket_locklist[ i ] = bucket_locklist[ i + 1 ];
--bucket_locklist_count;
}
void mutex_bucket_lock( int bucket ) {
pthread_mutex_lock( &bucket_mutex );
while( bucket_check( bucket ) )
pthread_cond_wait( &bucket_being_unlocked, &bucket_mutex );
bucket_push( bucket );
pthread_mutex_unlock( &bucket_mutex );
}
void mutex_bucket_unlock( int bucket ) {
pthread_mutex_lock( &bucket_mutex );
bucket_remove( bucket );
pthread_cond_broadcast( &bucket_being_unlocked );
pthread_mutex_unlock( &bucket_mutex );
}
void mutex_init( ) {
pthread_mutex_init(&bucket_mutex, NULL);
pthread_cond_init (&bucket_being_unlocked, NULL);
}
void mutex_deinit( ) {
pthread_mutex_destroy(&bucket_mutex);
pthread_cond_destroy(&bucket_being_unlocked);
}