From a500a5e534b3c03c685f3397050afe6667b740f8 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Mon, 16 Mar 2026 01:39:48 +0000
Subject:  Add phread_mutex_clocklock() sysdep, pthread_mutex_tailock()
 function

---
 src/libstddjb/pthread_mutex_tailock.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 src/libstddjb/pthread_mutex_tailock.c

(limited to 'src/libstddjb')

diff --git a/src/libstddjb/pthread_mutex_tailock.c b/src/libstddjb/pthread_mutex_tailock.c
new file mode 100644
index 0000000..affa8b3
--- /dev/null
+++ b/src/libstddjb/pthread_mutex_tailock.c
@@ -0,0 +1,24 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <time.h>
+#include <pthread.h>
+
+#include <skalibs/sysdeps.h>
+#include <skalibs/tai.h>
+#include <skalibs/pthread.h>
+
+int pthread_mutex_tailock (pthread_mutex_t *mtx, tain const *deadline, tain *stamp)
+{
+  struct timespec ts ;
+  tain tto ;
+  tain_sub(&tto, deadline, stamp) ;
+  if (!timespec_from_tain_relative(&ts, &tto)) return errno ;
+#ifdef SKALIBS_HASPTHREADMUTEXCLOCKLOCK
+  if (&tain_now != &tain_wallclock_read)
+    return pthread_mutex_clocklock(mtx, CLOCK_MONOTONIC, &ts) ;
+  else
+#else
+  return pthread_mutex_timedlock(mtx, &ts) ;
+#endif
+}
-- 
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