From 5411b208af6b45cd45b00f45bc135b65a7ae899f Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@operamail.com>
Date: Sun, 17 May 2015 14:49:22 +0200
Subject: timed write example
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Signed-off-by: Mattias Andrée <maandree@operamail.com>
---
 doc/examples/timed/.gitignore  |  1 +
 doc/examples/timed/Makefile    |  2 +-
 doc/examples/timed/README      | 12 +++++++++--
 doc/examples/timed/poll.c      |  1 -
 doc/examples/timed/slow-poll.c | 46 ++++++++++++++++++++++++++++++++++++++++++
 doc/examples/timed/write.c     |  5 ++++-
 6 files changed, 62 insertions(+), 5 deletions(-)
 create mode 100644 doc/examples/timed/slow-poll.c

diff --git a/doc/examples/timed/.gitignore b/doc/examples/timed/.gitignore
index b1076f0..cb90bfb 100644
--- a/doc/examples/timed/.gitignore
+++ b/doc/examples/timed/.gitignore
@@ -3,4 +3,5 @@ init
 write
 poll
 read
+slow-poll
 
diff --git a/doc/examples/timed/Makefile b/doc/examples/timed/Makefile
index fe1285c..9506947 100644
--- a/doc/examples/timed/Makefile
+++ b/doc/examples/timed/Makefile
@@ -1,4 +1,4 @@
-COMMANDS = init cleanup write poll read
+COMMANDS = init cleanup write poll read slow-poll
 
 all: ${COMMANDS}
 
diff --git a/doc/examples/timed/README b/doc/examples/timed/README
index 215a738..8293758 100644
--- a/doc/examples/timed/README
+++ b/doc/examples/timed/README
@@ -12,11 +12,19 @@ When you are done run ./cleanup.
 Running instances of ./poll will wait for new messages
 continuously, but with one second timeouts.
 
+./slow-poll works like ./poll, execpt it will sleep
+for one second every time it receives a message.
+
 Running instances of ./read will read for ten seconds
 then time out.
 
-./poll and ./read will stop if the message "stop" is
-broadcasted.
+./poll, ./read, and ./slow-poll will stop if the message
+"stop" is broadcasted.
+
+./write will wait for atmost a tenth of a seconds before
+failing. This means that if two instances of ./write is
+started at the same time one of them will fail if
+./slow-poll is running.
 
 ./poll, ./read, ./init and ./cleanup are run without any
 additional arguments. ./write is run with the message
diff --git a/doc/examples/timed/poll.c b/doc/examples/timed/poll.c
index d57d4ea..5ae45d4 100644
--- a/doc/examples/timed/poll.c
+++ b/doc/examples/timed/poll.c
@@ -24,7 +24,6 @@ main()
 		if (message == NULL) {
 			t(errno != EAGAIN);
 			printf("waiting... %lli\n", ++tick);
-			sleep(1);
 			continue;
 		}
 		tick = 0;
diff --git a/doc/examples/timed/slow-poll.c b/doc/examples/timed/slow-poll.c
new file mode 100644
index 0000000..5076ef6
--- /dev/null
+++ b/doc/examples/timed/slow-poll.c
@@ -0,0 +1,46 @@
+#include <bus.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#define t(stmt)  if (stmt) goto fail
+
+
+
+int
+main()
+{
+	bus_t bus;
+	const char *message;
+	long long tick = 0;
+	struct timespec timeout;
+	t(bus_open(&bus, "/tmp/example-bus", BUS_RDONLY));
+	t(bus_poll_start(&bus));
+	for (;;) {
+		t(clock_gettime(CLOCK_MONOTONIC, &timeout));
+		timeout.tv_sec += 1;
+		message = bus_poll_timed(&bus, &timeout, CLOCK_MONOTONIC);
+		if (message == NULL) {
+			t(errno != EAGAIN);
+			printf("waiting... %lli\n", ++tick);
+			continue;
+		}
+		tick = 0;
+		message = strchr(message, ' ') + 1;
+		if (!strcmp(message, "stop"))
+			break;
+		printf("\033[01m%s\033[21m\n", message);
+		sleep(1);
+	}
+	t(bus_poll_stop(&bus));
+	bus_close(&bus);
+	return 0;
+
+fail:
+	perror("poll");
+	bus_poll_stop(&bus);
+	bus_close(&bus);
+	return 1;
+}
+
diff --git a/doc/examples/timed/write.c b/doc/examples/timed/write.c
index 250ba14..acd8c6f 100644
--- a/doc/examples/timed/write.c
+++ b/doc/examples/timed/write.c
@@ -15,13 +15,16 @@ int
 main(int argc, char *argv[])
 {
 	bus_t bus;
+	struct timespec timeout;
 	if (argc < 2) {
 		fprintf(stderr, "%s: USAGE: %s message\n", argv[0], argv[0]);
 		return 2;
 	}
 	sprintf(message, "0 %s", argv[1]);
 	t(bus_open(&bus, "/tmp/example-bus", BUS_WRONLY));
-	t(bus_write(&bus, message, 0));
+	t(clock_gettime(CLOCK_MONOTONIC, &timeout));
+	timeout.tv_nsec += 100000000L;
+	t(bus_write_timed(&bus, message, &timeout, CLOCK_MONOTONIC));
 	bus_close(&bus);
 	return 0;
 
-- 
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