Date: Fri, 5 Oct 2018 07:52:28 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r339191 - stable/9/lib/libusb Message-ID: <201810050752.w957qS0N002176@repo.freebsd.org>
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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+freebsd@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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