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The background download thread is being spawned again.

This commit is contained in:
Fufu Fang 2019-09-02 15:47:10 +01:00
parent 6c8a15d8cc
commit eb463478a8
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GPG Key ID: 0F6BB5EF6F8BB729
2 changed files with 12 additions and 10 deletions
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20
src/cache.c
View File

@ -922,12 +922,12 @@ static void *Cache_bgdl(void *arg)
uint8_t *recv_buf = calloc(cf->blksz, sizeof(uint8_t));
fprintf(stderr, "Cache_bgdl(): thread %lu: ", pthread_self());
long recv = path_download(cf->path, (char *) recv_buf, cf->blksz,
cf->next_offset);
cf->next_dl_offset);
if ( (recv == cf->blksz) ||
(cf->next_offset == (cf->content_length / cf->blksz * cf->blksz)) )
(cf->next_dl_offset == (cf->content_length / cf->blksz * cf->blksz)) )
{
Data_write(cf, recv_buf, recv, cf->next_offset);
Seg_set(cf, cf->next_offset, 1);
Data_write(cf, recv_buf, recv, cf->next_dl_offset);
Seg_set(cf, cf->next_dl_offset, 1);
} else {
fprintf(stderr,
"Cache_bgdl(): received %ld, possible network error.\n", recv);
@ -1012,17 +1012,19 @@ long Cache_read(Cache *cf, char * const output_buf, const off_t len,
/* -----------Download the next segment in background -------------------*/
bgdl:
;
off_t next_offset = round_div(offset_start, cf->blksz) * cf->blksz;
if ( (next_offset > dl_offset) &&
!Seg_exist(cf, cf->next_offset) &&
cf->next_offset < cf->content_length ){
off_t next_dl_offset = round_div(offset_start, cf->blksz) * cf->blksz;
// printf("offset_start: %ld, next_dl_offset: %ld, dl_offset: %ld, next_seg_exists: %d, content_length :%ld\n",
// offset_start, next_dl_offset, dl_offset, Seg_exist(cf, next_dl_offset), cf->content_length);
if ( (next_dl_offset > dl_offset) &&
!Seg_exist(cf, next_dl_offset) &&
cf->next_dl_offset < cf->content_length ){
/* Stop the spawning of multiple background pthreads */
if(!pthread_mutex_trylock(&cf->bgt_lock)) {
#ifdef CACHE_LOCK_DEBUG
fprintf(stderr, "Cache_read(): thread %lu: trylocked bgt_lock;\n",
pthread_self());
#endif
cf->next_offset = next_offset;
cf->next_dl_offset = next_dl_offset;
if (pthread_create(&cf->bgt, NULL, Cache_bgdl, cf)) {
fprintf(stderr,
"Cache_read(): Error creating background download thread\n"

2
src/cache.h
View File

@ -62,7 +62,7 @@ struct Cache {
/** \brief mutex attributes for bgt_lock */
pthread_mutexattr_t bgt_lock_attr;
/** \brief the offset of the next segment to be downloaded in background*/
off_t next_offset;
off_t next_dl_offset;
};
/**