erofs-utils: optimize pthread_cond_signal calling

Call pthread_cond_signal once per file.

Signed-off-by: Noboru Asai <asai@sijam.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240501022420.1881305-1-asai@sijam.com
[ Gao Xiang: add potential overflow detection. ]
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

diff --git a/lib/compress.c b/lib/compress.c
index 9772543d2c8c3e8962264a122257dbe415a7a3a1..e3e4c21d3afde458287fe9041b4de2d75d1cc4dc 100644 (file)
--- a/lib/compress.c
+++ b/lib/compress.c
@@ -1260,8 +1260,10 @@ void z_erofs_mt_workfn(struct erofs_work *work, void *tlsp)
 out:
        cwork->errcode = ret;
        pthread_mutex_lock(&ictx->mutex);
-       ++ictx->nfini;
-       pthread_cond_signal(&ictx->cond);
+       if (++ictx->nfini >= ictx->seg_num) {
+               DBG_BUGON(ictx->nfini > ictx->seg_num);
+               pthread_cond_signal(&ictx->cond);
+       }
        pthread_mutex_unlock(&ictx->mutex);
 }