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[Qemu-devel] [PATCH] eventfd: making it rhread safe

From: Alexey Kardashevskiy
Subject: [Qemu-devel] [PATCH] eventfd: making it rhread safe
Date: Mon, 02 Jul 2012 05:48:16 +1000
User-agent: Mozilla/5.0 (X11; Linux i686; rv:12.0) Gecko/20120428 Thunderbird/12.0.1

QEMU uses IO handlers to run select() in the main loop. The handlers list is 
managed by qemu_set_fd_handler() helper which works fine when called from the 
main thread as it is called not when select() is waiting.

However sometime we need to update the handlers list from another thread. For 
that the main loop's select() needs to be restarted with the updated list.

The patch adds the qemu_notify_event() call to interrupt select() and make 
wrapping code to restart select() with the updated IO handlers list.

Signed-off-by: Alexey Kardashevskiy <address@hidden>
Reviewed-by: Paolo Bonzini <address@hidden>

 iohandler.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/iohandler.c b/iohandler.c
index 3c74de6..dea4355 100644
--- a/iohandler.c
+++ b/iohandler.c
@@ -77,6 +77,7 @@ int qemu_set_fd_handler2(int fd,
         ioh->fd_write = fd_write;
         ioh->opaque = opaque;
         ioh->deleted = 0;
+        qemu_notify_event();
     return 0;

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