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Tue, 31 Mar 2026 12:14:18 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id RLBuBpq6y2n2CQAAD6G6ig (envelope-from ); Tue, 31 Mar 2026 12:14:18 +0000 Date: Tue, 31 Mar 2026 14:14:25 +0200 From: Cyril Hrubis To: Andrea Cervesato Message-ID: References: <20260331-nanosleep_posix_fix-v1-1-7a707f871582@suse.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20260331-nanosleep_posix_fix-v1-1-7a707f871582@suse.com> X-Spamd-Result: default: False [-8.30 / 50.00]; REPLY(-4.00)[]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; TO_DN_ALL(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FUZZY_RATELIMITED(0.00)[rspamd.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; FROM_HAS_DN(0.00)[]; RCVD_TLS_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; MISSING_XM_UA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.cz:email] X-Virus-Scanned: clamav-milter 1.0.9 at in-2.smtp.seeweb.it X-Virus-Status: Clean Subject: Re: [LTP] [PATCH] nanosleep: Use CLOCK_MONOTONIC for elapsed time measurement X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Linux Test Project Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Hi! > All nanosleep POSIX conformance tests used CLOCK_REALTIME to measure > elapsed sleep duration. CLOCK_REALTIME can jump due to NTP corrections, > VM time sync, or other wall-clock adjustments, causing sporadic test > failures where measured time far exceeds expected sleep duration. > > Switch to CLOCK_MONOTONIC which is immune to wall-clock changes and is > the correct clock for measuring elapsed durations. Unfortunately CLOCK_MONOTONIC is optional in POSIX so we have to check if it's present at least at compile time with something as: #if _POSIX_MONOTONIC_CLOCK # define TEST_CLOCK CLOCK_MONOTONIC #else # define TEST_CLOCK CLOCK_REALTIME #endif -- Cyril Hrubis chrubis@suse.cz -- Mailing list info: https://lists.linux.it/listinfo/ltp