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lyrics fetcher: limit number of worker threads downloading lyrics in background

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This commit is contained in:
Andrzej Rybczak
2011-12-29 18:47:44 +01:00
parent e8f08ea884
commit 91477e034d
2 changed files with 58 additions and 16 deletions
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13
src/lyrics.h
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@@ -22,6 +22,7 @@
#define _LYRICS_H
#include <pthread.h>
#include <queue>
#include "ncmpcpp.h"
#include "mpdpp.h"
@@ -72,8 +73,16 @@ class Lyrics : public Screen<Scrollpad>
# ifdef HAVE_CURL_CURL_H
static void *DownloadInBackgroundImpl(void *);
// storage for songs for which lyrics are being downloaded at the moment
static std::set<MPD::Song *> itsDownloaded;
static void DownloadInBackgroundImplHelper(MPD::Song *);
// lock for allowing exclusive access to itsToDownload and itsWorkersNumber
static pthread_mutex_t itsDIBLock;
// storage for songs for which lyrics are scheduled to be downloaded
static std::queue<MPD::Song *> itsToDownload;
// current worker threads (ie. downloading lyrics)
static size_t itsWorkersNumber;
// maximum number of worker threads. if it's reached, next lyrics requests
// are put into itsToDownload queue.
static const size_t itsMaxWorkersNumber = 4;
void *Download();
static void *DownloadWrapper(void *);