From 40341a0eec50588f574199a3ee213dbb97b576e5 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Fri, 15 May 2015 15:04:25 +0200 Subject: fix nowait for polling + add nonblocking example MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- doc/bus_poll.3 | 8 ++++--- doc/examples/nonblocking/.gitignore | 5 +++++ doc/examples/nonblocking/Makefile | 13 ++++++++++++ doc/examples/nonblocking/cleanup.c | 8 +++++++ doc/examples/nonblocking/init.c | 8 +++++++ doc/examples/nonblocking/poll.c | 42 +++++++++++++++++++++++++++++++++++++ doc/examples/nonblocking/write.c | 32 ++++++++++++++++++++++++++++ 7 files changed, 113 insertions(+), 3 deletions(-) create mode 100644 doc/examples/nonblocking/.gitignore create mode 100644 doc/examples/nonblocking/Makefile create mode 100644 doc/examples/nonblocking/cleanup.c create mode 100644 doc/examples/nonblocking/init.c create mode 100644 doc/examples/nonblocking/poll.c create mode 100644 doc/examples/nonblocking/write.c (limited to 'doc') diff --git a/doc/bus_poll.3 b/doc/bus_poll.3 index 857ea20..7962082 100644 --- a/doc/bus_poll.3 +++ b/doc/bus_poll.3 @@ -6,9 +6,9 @@ bus_poll - Wait a message to be broadcasted .nf #include .P -int bus_poll_start(bus_t *bus); +int bus_poll_start(bus_t *bus, int flags); int bus_poll_stop(const bus_t *bus); -const char * bus_poll(bus_t *bus, int flags); +const char * bus_poll(bus_t *bus); .fi .SH DESCRIPTION The @@ -16,7 +16,9 @@ The function waits for a message to broadcasted on the \fIbus\fP, and return the message it receives. The function fails if there is not already a message waiting on the bus when the function is called and (\fIflags\fP -&BUS_NOWAIT). Received messages shall be copied and parsed, and acted +&BUS_NOWAIT) was used the last time +.BR bus_poll_start(3) +was called. Received messages shall be copied and parsed, and acted upon, in a separate thread, and .BR bus_poll(3) or diff --git a/doc/examples/nonblocking/.gitignore b/doc/examples/nonblocking/.gitignore new file mode 100644 index 0000000..e5c1856 --- /dev/null +++ b/doc/examples/nonblocking/.gitignore @@ -0,0 +1,5 @@ +cleanup +init +write +poll + diff --git a/doc/examples/nonblocking/Makefile b/doc/examples/nonblocking/Makefile new file mode 100644 index 0000000..1b1cbd3 --- /dev/null +++ b/doc/examples/nonblocking/Makefile @@ -0,0 +1,13 @@ +COMMANDS = init cleanup write poll + +all: ${COMMANDS} + +%: %.c + ${CC} -Wall -Wextra -pedantic -std=c99 -lbus -o $@ $< + +clean: + -rm ${COMMANDS} + + +.PHONY: all clean + diff --git a/doc/examples/nonblocking/cleanup.c b/doc/examples/nonblocking/cleanup.c new file mode 100644 index 0000000..00f07bc --- /dev/null +++ b/doc/examples/nonblocking/cleanup.c @@ -0,0 +1,8 @@ +#include +#include + +int main() +{ + return bus_unlink("/tmp/example-bus") && (perror("cleanup"), 1); +} + diff --git a/doc/examples/nonblocking/init.c b/doc/examples/nonblocking/init.c new file mode 100644 index 0000000..870e10d --- /dev/null +++ b/doc/examples/nonblocking/init.c @@ -0,0 +1,8 @@ +#include +#include + +int main() +{ + return bus_create("/tmp/example-bus", 0, NULL) && (perror("init"), 1); +} + diff --git a/doc/examples/nonblocking/poll.c b/doc/examples/nonblocking/poll.c new file mode 100644 index 0000000..c918b5b --- /dev/null +++ b/doc/examples/nonblocking/poll.c @@ -0,0 +1,42 @@ +#include +#include +#include +#include +#include + +#define t(stmt) if (stmt) goto fail + + + +int main() +{ + bus_t bus; + const char *message; + long long tick = 0; + t(bus_open(&bus, "/tmp/example-bus", BUS_RDONLY)); + t(bus_poll_start(&bus, BUS_NOWAIT)); + for (;;) { + message = bus_poll(&bus); + if (message == NULL) { + t(errno != EAGAIN); + printf("waiting... %lli\n", ++tick); + sleep(1); + continue; + } + tick = 0; + message = strchr(message, ' ') + 1; + if (!strcmp(message, "stop")) + break; + printf("\033[01m%s\033[21m\n", message); + } + 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/nonblocking/write.c b/doc/examples/nonblocking/write.c new file mode 100644 index 0000000..7fe9690 --- /dev/null +++ b/doc/examples/nonblocking/write.c @@ -0,0 +1,32 @@ +#include +#include +#include +#include + +#define t(stmt) if (stmt) goto fail + + + +static char message[BUS_MEMORY_SIZE]; + + + +int main(int argc, char *argv[]) +{ + bus_t bus; + 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, BUS_NOWAIT)); + bus_close(&bus); + return 0; + +fail: + perror("write"); + bus_close(&bus); + return 1; +} + -- cgit v1.2.3-70-g09d2