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Make sync generation multithreaded.
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erdgeist
parent
e65a41d000
commit
4072f162b4
123
ot_sync.c
123
ot_sync.c
@ -6,6 +6,7 @@
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#include <sys/mman.h>
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#include <stdio.h>
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#include <string.h>
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#include <pthread.h>
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/* Libowfat */
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#include "scan.h"
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@ -17,6 +18,9 @@
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#include "ot_sync.h"
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#ifdef WANT_TRACKER_SYNC
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#define OT_SYNC_CHUNK_SIZE (512*1024)
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/* Import Changeset from an external authority
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format: d4:syncd[..]ee
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[..]: ( 20:01234567890abcdefghij16:XXXXYYYY )+
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@ -60,48 +64,103 @@ int add_changeset_to_tracker( ot_byte *data, size_t len ) {
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/* Proposed output format
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d4:syncd20:<info_hash>8*N:(xxxxyyyy)*Nee
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*/
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size_t return_changeset_for_tracker( char **reply ) {
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size_t allocated = 0, i, replysize;
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ot_vector *torrents_list;
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static void sync_make( int *iovec_entries, struct iovec **iovector ) {
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int bucket;
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char *r;
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char *r, *re;
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/* Maybe there is time to clean_all_torrents(); */
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/* Setup return vector... */
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*iovec_entries = 0;
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*iovector = NULL;
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if( !( r = iovec_increase( iovec_entries, iovector, OT_SYNC_CHUNK_SIZE ) ) )
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return;
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/* Determine space needed for whole changeset */
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for( bucket = 0; bucket < OT_BUCKET_COUNT; ++bucket ) {
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torrents_list = mutex_bucket_lock(bucket);
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for( i=0; i<torrents_list->size; ++i ) {
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ot_torrent *torrent = ((ot_torrent*)(torrents_list->data)) + i;
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allocated += sizeof( ot_hash ) + sizeof(ot_peer) * torrent->peer_list->changeset.size + 13;
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}
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mutex_bucket_unlock(bucket);
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}
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/* add "d4:syncd" and "ee" */
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allocated += 8 + 2;
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if( !( r = *reply = mmap( NULL, allocated, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0 ) ) )
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return 0;
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/* ... and pointer to end of current output buffer.
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This works as a low watermark */
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re = r + OT_SYNC_CHUNK_SIZE;
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memmove( r, "d4:syncd", 8 ); r += 8;
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for( bucket = 0; bucket < OT_BUCKET_COUNT; ++bucket ) {
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torrents_list = mutex_bucket_lock(bucket);
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for( i=0; i<torrents_list->size; ++i ) {
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ot_torrent *torrent = ((ot_torrent*)(torrents_list->data)) + i;
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const size_t byte_count = sizeof(ot_peer) * torrent->peer_list->changeset.size;
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/* For each bucket... */
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for( bucket=0; bucket<OT_BUCKET_COUNT; ++bucket ) {
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/* Get exclusive access to that bucket */
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ot_vector *torrents_list = mutex_bucket_lock( bucket );
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size_t tor_offset;
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/* For each torrent in this bucket.. */
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for( tor_offset=0; tor_offset<torrents_list->size; ++tor_offset ) {
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/* Address torrents members */
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ot_peerlist *peer_list = ( ((ot_torrent*)(torrents_list->data))[tor_offset] ).peer_list;
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ot_hash *hash =&( ((ot_torrent*)(torrents_list->data))[tor_offset] ).hash;
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const size_t byte_count = sizeof(ot_peer) * peer_list->changeset.size;
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/* If we reached our low watermark in buffer... */
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if( re - r <= (ssize_t)(/* strlen( "20:" ) == */ 3 + sizeof( ot_hash ) + /* strlen_max( "%zd" ) == */ 12 + byte_count ) ) {
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/* crop current output buffer to the amount really used */
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iovec_fixlast( iovec_entries, iovector, OT_SYNC_CHUNK_SIZE - ( re - r ) );
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/* And allocate a fresh output buffer at the end of our buffers list */
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if( !( r = iovec_increase( iovec_entries, iovector, OT_SYNC_CHUNK_SIZE ) ) ) {
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/* If this fails: free buffers */
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iovec_free( iovec_entries, iovector );
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/* Release lock on current bucket and return */
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mutex_bucket_unlock( bucket );
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return;
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}
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/* Adjust new end of output buffer */
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re = r + OT_SYNC_CHUNK_SIZE;
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}
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*r++ = '2'; *r++ = '0'; *r++ = ':';
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memmove( r, torrent->hash, sizeof( ot_hash ) ); r += sizeof( ot_hash );
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memmove( r, hash, sizeof( ot_hash ) ); r += sizeof( ot_hash );
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r += sprintf( r, "%zd:", byte_count );
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memmove( r, torrent->peer_list->changeset.data, byte_count ); r += byte_count;
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memmove( r, peer_list->changeset.data, byte_count ); r += byte_count;
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}
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mutex_bucket_unlock(bucket);
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/* All torrents done: release lock on currenct bucket */
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mutex_bucket_unlock( bucket );
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}
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*r++ = 'e'; *r++ = 'e';
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replysize = ( r - *reply );
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fix_mmapallocation( *reply, allocated, replysize );
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/* Close bencoded sync dictionary */
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*r++='e'; *r++='e';
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return replysize;
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/* Release unused memory in current output buffer */
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iovec_fixlast( iovec_entries, iovector, OT_SYNC_CHUNK_SIZE - ( re - r ) );
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}
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/* This is the entry point into this worker thread
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It grabs tasks from mutex_tasklist and delivers results back
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*/
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static void * sync_worker( void * args) {
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int iovec_entries;
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struct iovec *iovector;
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args = args;
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while( 1 ) {
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ot_tasktype tasktype = TASK_SYNC_OUT;
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ot_taskid taskid = mutex_workqueue_poptask( &tasktype );
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sync_make( &iovec_entries, &iovector );
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if( mutex_workqueue_pushresult( taskid, iovec_entries, iovector ) )
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iovec_free( &iovec_entries, &iovector );
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}
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return NULL;
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}
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static pthread_t thread_id;
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void sync_init( ) {
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pthread_create( &thread_id, NULL, sync_worker, NULL );
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}
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void sync_deinit( ) {
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pthread_cancel( thread_id );
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}
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void sync_deliver( int64 socket ) {
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mutex_workqueue_pushtask( socket, TASK_SYNC_OUT );
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}
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#endif
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