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+freebsd@gmail.com> PR: 231742 MFC after: 1 week Approved by: re (kib) Sponsored by: Mellanox Technologies
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@ -312,6 +312,9 @@ libusb_wait_for_event(libusb_context *ctx, struct timeval *tv)
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if (tv == NULL) {
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pthread_cond_wait(&ctx->ctx_cond,
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&ctx->ctx_lock);
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/* try to grab polling of actual events, if any */
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if (ctx->ctx_handler == NO_THREAD)
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ctx->ctx_handler = pthread_self();
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return (0);
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}
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err = clock_gettime(CLOCK_MONOTONIC, &ts);
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@ -330,6 +333,9 @@ libusb_wait_for_event(libusb_context *ctx, struct timeval *tv)
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}
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err = pthread_cond_timedwait(&ctx->ctx_cond,
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&ctx->ctx_lock, &ts);
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/* try to grab polling of actual events, if any */
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if (ctx->ctx_handler == NO_THREAD)
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ctx->ctx_handler = pthread_self();
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if (err == ETIMEDOUT)
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return (1);
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