core: remove use of clock_gettime(3)

The portability of clock_gettime(3) on Mac OS / OS X
is... complicated.  Per
Homebrew/homebrew-core#6551 and
ofiwg#2508, remove the use of
clock_gettime(3) from the core of libfabric.  clock_gettime(3) is
still used in some providers that do not compile on OS X / MacOS, but
that's ok).

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

Makefile.am

@@ -57,10 +57,6 @@ common_srcs = \
 	prov/util/src/util_mr.c
 
 if MACOS
-if !HAVE_CLOCK_GETTIME
-common_srcs += src/osx/osd.c
-endif
-
 common_srcs += src/unix/osd.c
 common_srcs += include/osx/osd.h
 common_srcs += include/unix/osd.h

configure.ac

@@ -125,24 +125,11 @@ fi
 AC_DEFINE_UNQUOTED([PT_LOCK_SPIN], [$have_spinlock],
 	[Define to 1 if pthread_spin_init is available.])
 
-have_clock_gettime=0
-
 AC_CHECK_FUNCS([epoll_create])
 if test "$ac_cv_func_epoll_create" = yes; then
   AC_DEFINE([HAVE_EPOLL], [1], [Define if you have epoll support.])
 fi
 
-AC_SEARCH_LIBS([clock_gettime],[rt],
-		[have_clock_gettime=1],
-		[AC_CHECK_FUNCS([host_get_clock_service],
-			[],
-			[AC_MSG_ERROR([clock_gettime or host_get_clock_service
-			 not found.])])])
-
-AC_DEFINE_UNQUOTED(HAVE_CLOCK_GETTIME, [$have_clock_gettime],
-		   [Define to 1 if clock_gettime is available.])
-AM_CONDITIONAL(HAVE_CLOCK_GETTIME, [test $have_clock_gettime -eq 1])
-
 dnl Check for gcc atomic intrinsics
 AC_MSG_CHECKING(compiler support for c11 atomics)
 AC_TRY_LINK([#include <stdatomic.h>],

include/fi_lock.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2013-2014 Intel Corporation. All rights reserved.
+ * Copyright (c) 2016 Cisco Systems, Inc. All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
@@ -47,7 +48,7 @@ extern "C" {
 #endif
 
 
-int fi_wait_cond(pthread_cond_t *cond, pthread_mutex_t *mut, int timeout);
+int fi_wait_cond(pthread_cond_t *cond, pthread_mutex_t *mut, int timeout_ms);
 
 
 #if PT_LOCK_SPIN == 1

include/osx/osd.h

@@ -62,19 +62,6 @@
 extern "C" {
 #endif
 
-/* macOS Sierra added clock_gettime to libc. This implementation should only
- * take effect if it is not available.
- */
-#if !HAVE_CLOCK_GETTIME
-
-#define CLOCK_REALTIME CALENDAR_CLOCK
-#define CLOCK_MONOTONIC SYSTEM_CLOCK
-
-typedef int clockid_t;
-int clock_gettime(clockid_t clk_id, struct timespec *tp);
-
-#endif
-
 static inline int ofi_shm_remap(struct util_shm *shm, size_t newsize, void **mapped)
 {
 	return -1;

src/unix/osd.c

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2013-2016 Intel Corporation. All rights reserved.
+ * Copyright (c) 2016 Cisco Systems, Inc.  All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
@@ -42,6 +43,7 @@
 #include <string.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
+#include <sys/time.h>
 
 #include "fi.h"
 #include "fi_osd.h"
@@ -65,16 +67,17 @@ int fi_fd_nonblock(int fd)
 	return 0;
 }
 
-int fi_wait_cond(pthread_cond_t *cond, pthread_mutex_t *mut, int timeout)
+int fi_wait_cond(pthread_cond_t *cond, pthread_mutex_t *mut, int timeout_ms)
 {
+	uint64_t t;
 	struct timespec ts;
 
-	if (timeout < 0)
+	if (timeout_ms < 0)
 		return pthread_cond_wait(cond, mut);
 
-	clock_gettime(CLOCK_REALTIME, &ts);
-	ts.tv_sec += timeout / 1000;
-	ts.tv_nsec += (timeout % 1000) * 1000000;
+	t = fi_gettime_us();
+	ts.tv_sec = t / 1000000;
+	ts.tv_nsec = t % 1000000;
 	return pthread_cond_timedwait(cond, mut, &ts);
 }
 

util/pingpong.c

@@ -181,8 +181,8 @@ struct ct_pingpong {
 	void *buf, *tx_buf, *rx_buf;
 	size_t buf_size, tx_size, rx_size;
 
-	int timeout;
-	struct timespec start, end;
+	int timeout_sec;
+	uint64_t start, end;
 
 	struct fi_av_attr av_attr;
 	struct fi_eq_attr eq_attr;
@@ -203,26 +203,16 @@ static const int integ_alphabet_length =
 	(sizeof(integ_alphabet) / sizeof(*integ_alphabet)) - 1;
 
 /*******************************************************************************
- *                                  Compatibility methods
+ *                                         Utils
  ******************************************************************************/
-#if defined(__APPLE__) && !HAVE_CLOCK_GETTIME
-int clock_gettime(clockid_t clk_id, struct timespec *tp)
-{
-	int retval;
-	struct timeval tv;
 
-	retval = gettimeofday(&tv, NULL);
-
-	tp->tv_sec = tv.tv_sec;
-	tp->tv_nsec = tv.tv_usec * 1000;
+uint64_t pp_gettime_us(void)
+{
+	struct timeval now;
 
-	return retval;
+	gettimeofday(&now, NULL);
+	return now.tv_sec * 1000000 + now.tv_usec;
 }
-#endif
-
-/*******************************************************************************
- *                                         Utils
- ******************************************************************************/
 
 long parse_ulong(char *str, long max)
 {
@@ -804,12 +794,12 @@ static inline void pp_start(struct ct_pingpong *ct)
 {
 	PP_DEBUG("Starting test chrono\n");
 	ct->opts.options |= PP_OPT_ACTIVE;
-	clock_gettime(CLOCK_MONOTONIC, &(ct->start));
+	ct->start = pp_gettime_us();
 }
 
 static inline void pp_stop(struct ct_pingpong *ct)
 {
-	clock_gettime(CLOCK_MONOTONIC, &(ct->end));
+	ct->end = pp_gettime_us();
 	ct->opts.options &= ~PP_OPT_ACTIVE;
 	PP_DEBUG("Stopped test chrono\n");
 }
@@ -1015,22 +1005,12 @@ char *cnt_str(char *str, size_t size, uint64_t cnt)
 	return str;
 }
 
-int64_t get_elapsed(const struct timespec *b, const struct timespec *a,
-		    enum precision p)
-{
-	int64_t elapsed;
-
-	elapsed = difftime(a->tv_sec, b->tv_sec) * 1000 * 1000 * 1000;
-	elapsed += a->tv_nsec - b->tv_nsec;
-	return elapsed / p;
-}
-
 void show_perf(char *name, int tsize, int sent, int acked,
-	       struct timespec *start, struct timespec *end, int xfers_per_iter)
+	       uint64_t start, uint64_t end, int xfers_per_iter)
 {
 	static int header = 1;
 	char str[PP_STR_LEN];
-	int64_t elapsed = get_elapsed(start, end, MICRO);
+	int64_t elapsed = end - start;
 	uint64_t bytes = (uint64_t)sent * tsize * xfers_per_iter;
 	float usec_per_xfer;
 
@@ -1094,20 +1074,20 @@ int pp_cq_readerr(struct fid_cq *cq)
 }
 
 static int pp_get_cq_comp(struct fid_cq *cq, uint64_t *cur, uint64_t total,
-			  int timeout)
+			  int timeout_sec)
 {
 	struct fi_cq_err_entry comp;
-	struct timespec a = {0}, b = {0};
+	uint64_t a = 0, b = 0;
 	int ret = 0;
 
-	if (timeout >= 0)
-		clock_gettime(CLOCK_MONOTONIC, &a);
+	if (timeout_sec >= 0)
+		a = pp_gettime_us();
 
 	while (total - *cur > 0) {
 		ret = fi_cq_read(cq, &comp, 1);
 		if (ret > 0) {
-			if (timeout >= 0)
-				clock_gettime(CLOCK_MONOTONIC, &a);
+			if (timeout_sec >= 0)
+				a = pp_gettime_us();
 
 			(*cur)++;
 		} else if (ret < 0 && ret != -FI_EAGAIN) {
@@ -1119,11 +1099,11 @@ static int pp_get_cq_comp(struct fid_cq *cq, uint64_t *cur, uint64_t total,
 			}
 
 			return ret;
-		} else if (timeout >= 0) {
-			clock_gettime(CLOCK_MONOTONIC, &b);
-			if ((b.tv_sec - a.tv_sec) > timeout) {
+		} else if (timeout_sec >= 0) {
+			b = pp_gettime_us();
+			if ((b - a) / 1000000 > timeout_sec) {
 				fprintf(stderr, "%ds timeout expired\n",
-					timeout);
+					timeout_sec);
 				return -FI_ENODATA;
 			}
 		}
@@ -1138,7 +1118,7 @@ int pp_get_rx_comp(struct ct_pingpong *ct, uint64_t total)
 
 	if (ct->rxcq) {
 		ret = pp_get_cq_comp(ct->rxcq, &(ct->rx_cq_cntr), total,
-				     ct->timeout);
+				     ct->timeout_sec);
 	} else {
 		PP_ERR(
 		    "Trying to get a RX completion when no RX CQ was opened");
@@ -1163,7 +1143,7 @@ int pp_get_tx_comp(struct ct_pingpong *ct, uint64_t total)
 
 #define PP_POST(post_fn, comp_fn, seq, op_str, ...)                            \
 	do {                                                                   \
-		int timeout_save;                                              \
+		int timeout_sec_save;                                          \
 		int ret, rc;                                                   \
 									       \
 		while (1) {                                                    \
@@ -1176,10 +1156,10 @@ int pp_get_tx_comp(struct ct_pingpong *ct, uint64_t total)
 				return ret;                                    \
 			}                                                      \
 									       \
-			timeout_save = ct->timeout;                            \
-			ct->timeout = 0;                                       \
+			timeout_sec_save = ct->timeout_sec;                    \
+			ct->timeout_sec = 0;                                   \
 			rc = comp_fn(ct, seq);                                 \
-			ct->timeout = timeout_save;                            \
+			ct->timeout_sec = timeout_sec_save;                    \
 			if (rc && rc != -FI_EAGAIN) {                          \
 				PP_ERR("Failed to get " op_str " completion"); \
 				return rc;                                     \
@@ -2035,7 +2015,7 @@ int pingpong(struct ct_pingpong *ct)
 
 	PP_DEBUG("Results:\n");
 	show_perf(NULL, ct->opts.transfer_size, ct->opts.iterations,
-		  ct->cnt_ack_msg, &(ct->start), &(ct->end), 2);
+		  ct->cnt_ack_msg, ct->start, ct->end, 2);
 
 	return 0;
 }
@@ -2149,7 +2129,7 @@ int main(int argc, char **argv)
 	ret = EXIT_SUCCESS;
 
 	struct ct_pingpong ct = {
-		.timeout = -1,
+		.timeout_sec = -1,
 		.ctrl_connfd = -1,
 		.opts = {
 			.iterations = 1000,