Changeset 41dcabc in mainline

Timestamp:

2025-01-18T12:10:11Z (13 days ago)

Author:

Jiří Zárevúcky <zarevucky.jiri@…>

Branches:

master

Children:

afb4025

Parents:

b8fd951

Message:

libc: Prevent writer starvation in fibril_rwlock_t.

Thanks to Miroslav Cimerman for pointing this issue out.

File:

• uspace/lib/c/generic/thread/fibril_synch.c (modified) (1 diff)

uspace/lib/c/generic/thread/fibril_synch.c

@@ -263 +263 @@
         futex_lock(&fibril_synch_futex);
 
-        if (!frw->writers) {
+        if (!frw->writers && list_empty(&frw->waiters)) {
                 /* Consider the first reader the owner. */
                 if (frw->readers++ == 0)