Author: hselasky
Date: Fri Oct 5 07:52:28 2018
New Revision: 339191
URL: https://svnweb.freebsd.org/changeset/base/339191
Log:
MFC r338993:
When multiple threads are involved receiving completion events in LibUSB
make sure there is always a master polling thread, by setting the
"ctx_handler"
field in the context. Else the reception of completion events can stop.
This happens if event threads are created and destroyed during runtime.
Found by: Ludovic Rousseau <ludovic.rousseau+free...@gmail.com>
PR: 231742
Sponsored by: Mellanox Technologies
Modified:
stable/9/lib/libusb/libusb10_io.c
Directory Properties:
stable/9/lib/ (props changed)
stable/9/lib/libusb/ (props changed)
Modified: stable/9/lib/libusb/libusb10_io.c
==============================================================================
--- stable/9/lib/libusb/libusb10_io.c Fri Oct 5 07:50:44 2018
(r339190)
+++ stable/9/lib/libusb/libusb10_io.c Fri Oct 5 07:52:28 2018
(r339191)
@@ -305,6 +305,9 @@ libusb_wait_for_event(libusb_context *ctx, struct time
if (tv == NULL) {
pthread_cond_wait(&ctx->ctx_cond,
&ctx->ctx_lock);
+ /* try to grab polling of actual events, if any */
+ if (ctx->ctx_handler == NO_THREAD)
+ ctx->ctx_handler = pthread_self();
return (0);
}
err = clock_gettime(CLOCK_MONOTONIC, &ts);
@@ -323,6 +326,9 @@ libusb_wait_for_event(libusb_context *ctx, struct time
}
err = pthread_cond_timedwait(&ctx->ctx_cond,
&ctx->ctx_lock, &ts);
+ /* try to grab polling of actual events, if any */
+ if (ctx->ctx_handler == NO_THREAD)
+ ctx->ctx_handler = pthread_self();
if (err == ETIMEDOUT)
return (1);
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