Changeset 8619f25 in mainline for uspace/lib/libc/generic/async.c

Timestamp:

2009-08-21T07:25:50Z (15 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

207e208e

Parents:

057d21a

Message:

Fibril synchronization needs to have a means to interrupt
idle threads from waiting for IPC and get them to execute
awakened fibrils.

File:

• uspace/lib/libc/generic/async.c (modified) (3 diffs)

uspace/lib/libc/generic/async.c

@@ -106 +106 @@
 
 atomic_t async_futex = FUTEX_INITIALIZER;
+
+/** Number of threads waiting for IPC in the kernel. */
+atomic_t threads_in_ipc_wait = { 0 };
 
 /** Structures of this type represent a waiting fibril. */
@@ -683 +686 @@
                 
                 futex_up(&async_futex);
+
+                atomic_inc(&threads_in_ipc_wait);
                 
                 ipc_call_t call;
@@ -688 +693 @@
                     SYNCH_FLAGS_NONE);
                 
+                atomic_dec(&threads_in_ipc_wait);
+
                 if (!callid) {
                         handle_expired_timeouts();