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ceb592f)
Users may want to use alternative sleeping behavior instead of
`poll'. Make CDS_WFCQ_WAIT_SLEEP a macro which may be defined
before including wfcqueue.h.
This alternative behavior could include logging, performing
low-priority cleanup work, sleeping a shorter/longer interval
or any combination of that.
This will also make integration into glibc easier, as `poll'
linkage causes conformance test failures even when relegated
to an impossible code path:
https://public-inbox.org/libc-alpha/
20180801092626.jrwyrojfye4avcis@whir/
Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
return ___cds_wfcq_append(head, tail, new_tail, new_tail);
}
return ___cds_wfcq_append(head, tail, new_tail, new_tail);
}
+/*
+ * CDS_WFCQ_WAIT_SLEEP:
+ *
+ * By default, this sleeps for the given @msec milliseconds.
+ * This is a macro which LGPL users may #define themselves before
+ * including wfcqueue.h to override the default behavior (e.g.
+ * to log a warning or perform other background work).
+ */
+#ifndef CDS_WFCQ_WAIT_SLEEP
+#define CDS_WFCQ_WAIT_SLEEP(msec) ___cds_wfcq_wait_sleep(msec)
+#endif
+
+static inline void ___cds_wfcq_wait_sleep(int msec)
+{
+ (void) poll(NULL, 0, msec);
+}
+
/*
* ___cds_wfcq_busy_wait: adaptative busy-wait.
*
/*
* ___cds_wfcq_busy_wait: adaptative busy-wait.
*
if (!blocking)
return 1;
if (++(*attempt) >= WFCQ_ADAPT_ATTEMPTS) {
if (!blocking)
return 1;
if (++(*attempt) >= WFCQ_ADAPT_ATTEMPTS) {
- (void) poll(NULL, 0, WFCQ_WAIT); /* Wait for 10ms */
+ CDS_WFCQ_WAIT_SLEEP(WFCQ_WAIT); /* Wait for 10ms */
*attempt = 0;
} else {
caa_cpu_relax();
*attempt = 0;
} else {
caa_cpu_relax();