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Remove coupling dep

v0.7.4-release
Felix Geisendörfer 15 years ago
committed by Ryan Dahl
parent
c143cba590
commit
203561208e
5 changed files with 2 additions and 581 deletions
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  1. 33
      deps/coupling/Makefile
  2. 419
      deps/coupling/coupling.c
  3. 42
      deps/coupling/coupling.h
  4. 73
      deps/coupling/test.c
  5. 16
      wscript

33
deps/coupling/Makefile
View File

@ -1,33 +0,0 @@
# CFLAGS and LDFLAGS are for the users to override from the command line.
CFLAGS = -g -I. -Wall -Werror -Wextra #-DNDEBUG=1
LDFLAGS = -pthread
CC = gcc
AR = ar
RANLIB = ranlib
DEP = coupling.h
SRC = coupling.c
OBJ = ${SRC:.c=.o}
NAME=libcoupling
OUTPUT_A=$(NAME).a
all: $(OUTPUT_A)
$(OUTPUT_A): $(OBJ)
$(AR) cru $(OUTPUT_A) $(OBJ)
$(RANLIB) $(OUTPUT_A)
.c.o:
$(CC) -c ${CFLAGS} $<
${OBJ}: ${DEP}
test: test.c $(OUTPUT_A)
$(CC) $(LDFLAGS) $(CFLAGS) -o $@ test.c $(OUTPUT_A)
clean:
rm -f $(OUTPUT_A) *.o test
.PHONY: all clean

419
deps/coupling/coupling.c
View File

@ -1,419 +0,0 @@
/* Copyright (c) 2009 Ryan Dahl (ry@tinyclouds.org)
*
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "coupling.h"
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/select.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <assert.h>
#include <pthread.h>
#ifdef PIPE_BUF
# define BUFSIZE PIPE_BUF
#else
# define BUFSIZE 4096
#endif
#define MAX(a,b) ((a) > (b) ? (a) : (b))
// ring buffer
typedef struct {
int head;
int tail;
int size;
char buf[BUFSIZE];
} ring_buffer;
static inline void
ring_buffer_inspect (ring_buffer *ring)
{
printf("size %5d head %5d tail %5d\n", ring->size, ring->head, ring->tail);
}
static inline void
ring_buffer_init (ring_buffer *ring)
{
ring->head = 0;
ring->tail = 0;
ring->size = 0;
}
static inline int
ring_buffer_filled_p (ring_buffer *ring)
{
assert(BUFSIZE - (long)ring->size >= 0);
return (BUFSIZE == ring->size);
}
static inline int
ring_buffer_empty_p (ring_buffer *ring)
{
return 0 == ring->size;
}
static ssize_t
ring_buffer_pull (ring_buffer *ring, int fd)
{
// DO NOT CALL WHEN FILLED
assert(!ring_buffer_filled_p(ring));
struct iovec iov[2];
int iovcnt = 1;
// Very tough logic. Can you follow? Barely can I.
iov[0].iov_base = ring->buf + ring->tail;
if (ring->tail < ring->head) {
iov[0].iov_len = ring->head - ring->tail;
} else {
iov[0].iov_len = BUFSIZE - ring->tail;
if (ring->head != 0) {
iovcnt = 2;
iov[1].iov_base = ring->buf;
iov[1].iov_len = ring->head;
}
}
int r = readv(fd, iov, iovcnt);
if (r > 0) {
ring->size += r;
ring->tail = (ring->tail + r) % BUFSIZE;
}
assert(ring->size <= BUFSIZE);
return r;
}
static ssize_t
ring_buffer_push (ring_buffer *ring, int fd)
{
// DO NOT CALL WHEN EMPTY
assert(!ring_buffer_empty_p(ring));
struct iovec iov[2];
int iovcnt = 1;
iov[0].iov_base = ring->buf + ring->head;
if (ring->head < ring->tail) {
iov[0].iov_len = ring->tail - ring->head;
} else {
iov[0].iov_len = BUFSIZE - ring->head;
if (ring->tail != 0) {
iovcnt = 2;
iov[1].iov_base = ring->buf;
iov[1].iov_len = ring->tail;
}
}
int r = writev(fd, iov, iovcnt);
if (r > 0) {
ring->size -= r;
ring->head = (ring->head + r) % BUFSIZE;
}
assert(0 <= (long)ring->size);
return r;
}
/* PULL PUMP
*
* This is used to read data from a blocking file descriptor and pump it into
* a non-blocking pipe (or other non-blocking fd). The algorithm is this:
*
* while (true) {
* read(STDIN_FILENO) // blocking
*
* while (!ring.empty) {
* write(pipe) // non-blocking
* select(pipe, writable)
* }
* }
*
*/
static void
pull_pump (int pullfd, int pushfd)
{
int r;
ring_buffer ring;
fd_set writefds, exceptfds;
FD_ZERO(&exceptfds);
FD_ZERO(&writefds);
FD_SET(pushfd, &exceptfds);
FD_SET(pushfd, &writefds);
ring_buffer_init(&ring);
while (pullfd >= 0) {
/* Blocking read from STDIN_FILENO */
r = ring_buffer_pull(&ring, pullfd);
if (r == 0) {
/* eof */
close(pullfd);
pullfd = -1;
} else if (r < 0 && errno != EINTR && errno != EAGAIN) {
/* error */
perror("pull_pump read()");
close(pullfd);
pullfd = -1;
}
/* Push all of the data in the ring buffer out. */
while (!ring_buffer_empty_p(&ring)) {
/* non-blocking write() to the pipe */
r = ring_buffer_push(&ring, pushfd);
if (r < 0 && errno != EAGAIN && errno != EINTR) {
if (errno == EPIPE) {
/* This happens if someone closes the other end of the pipe. This
* is a normal forced close of STDIN. Hopefully there wasn't data
* in the ring buffer. Just close both ends and exit.
*/
close(pushfd);
close(pullfd);
pushfd = pullfd = -1;
} else {
perror("pull_pump write()");
close(pushfd);
close(pullfd);
}
return;
}
/* Select for writablity on the pipe end.
* Very rarely will this stick.
*/
r = select(pushfd+1, NULL, &writefds, &exceptfds, NULL);
if (r < 0 || FD_ISSET(pushfd, &exceptfds)) {
close(pushfd);
close(pullfd);
pushfd = pullfd = -1;
return;
}
}
}
assert(pullfd < 0);
assert(ring_buffer_empty_p(&ring));
close(pushfd);
}
/* PUSH PUMP
*
* This is used to push data out to a blocking file descriptor. It pulls
* data from a non-blocking pipe (pullfd) and pushes to STDOUT_FILENO
* (pushfd).
* When the pipe is closed, then the rest of the data is pushed out and then
* STDOUT_FILENO is closed.
*
* The algorithm looks roughly like this:
*
* while (true) {
* r = read(pipe) // nonblocking
*
* while (!ring.empty) {
* write(STDOUT_FILENO) // blocking
* }
*
* select(pipe, readable);
* }
*/
static void
push_pump (int pullfd, int pushfd)
{
int r;
ring_buffer ring;
fd_set readfds, exceptfds;
FD_ZERO(&exceptfds);
FD_ZERO(&readfds);
FD_SET(pullfd, &exceptfds);
FD_SET(pullfd, &readfds);
ring_buffer_init(&ring);
/* The pipe is open or there is data left to be pushed out
* NOTE: if pushfd (STDOUT_FILENO) ever errors out, then we just exit the
* loop.
*/
while (pullfd >= 0 || !ring_buffer_empty_p(&ring)) {
/* Pull from the non-blocking pipe */
r = ring_buffer_pull(&ring, pullfd);
if (r == 0) {
/* eof */
close(pullfd);
pullfd = -1;
} else if (r < 0 && errno != EINTR && errno != EAGAIN) {
perror("push_pump read()");
close(pullfd);
pullfd = -1;
return;
}
/* Push everything out to STDOUT */
while (!ring_buffer_empty_p(&ring)) {
/* Blocking write() to pushfd (STDOUT_FILENO) */
r = ring_buffer_push(&ring, pushfd);
/* If there was a problem, just exit the entire function */
if (r < 0 && errno != EINTR && errno != EAGAIN) {
close(pushfd);
close(pullfd);
pushfd = pullfd = -1;
return;
}
}
if (pullfd >= 0) {
/* select for readability on the pullfd */
r = select(pullfd+1, &readfds, NULL, &exceptfds, NULL);
if (r < 0 || FD_ISSET(pullfd, &exceptfds)) {
close(pushfd);
close(pullfd);
pushfd = pullfd = -1;
return;
}
}
}
/* If we got here then we got eof on pullfd and pushed all the data out.
* so now just close pushfd */
assert(pullfd < 0);
assert(ring_buffer_empty_p(&ring));
close(pushfd);
}
static inline int
set_nonblock (int fd)
{
int flags = fcntl(fd, F_GETFL, 0);
if (flags == -1) return -1;
int r = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
if (r == -1) return -1;
return 0;
}
struct coupling {
int is_pull;
int pullfd;
int pushfd;
int exposedfd;
pthread_t tid;
};
static void *
pump_thread (void *data)
{
struct coupling *c = (struct coupling*)data;
if (c->is_pull) {
pull_pump(c->pullfd, c->pushfd);
} else {
push_pump(c->pullfd, c->pushfd);
}
return NULL;
}
static struct coupling*
create_coupling (int fd, int is_pull)
{
int pipefd[2];
struct coupling *c = malloc(sizeof(struct coupling));
if (!c) return NULL;
int r = pipe(pipefd);
if (r < 0) return NULL;
r = set_nonblock(pipefd[0]);
if (r < 0) return NULL;
assert(pipefd[0] >= 0);
r = set_nonblock(pipefd[1]);
if (r < 0) return NULL;
assert(pipefd[1] >= 0);
if (is_pull) {
c->is_pull = 1;
c->pullfd = fd;
c->pushfd = pipefd[1];
c->exposedfd = pipefd[0];
} else {
c->is_pull = 0;
c->pushfd = fd;
c->pullfd = pipefd[0];
c->exposedfd = pipefd[1];
}
r = pthread_create(&c->tid, NULL, pump_thread, c);
if (r < 0) return NULL;
return c;
}
struct coupling*
coupling_new_pull (int fd)
{
return create_coupling(fd, 1);
}
struct coupling*
coupling_new_push (int fd)
{
return create_coupling(fd, 0);
}
int
coupling_nonblocking_fd (struct coupling *c)
{
return c->exposedfd;
}
void
coupling_join (struct coupling *c)
{
int r = pthread_join(c->tid, NULL);
assert(r == 0);
}
void
coupling_destroy (struct coupling *c)
{
close(c->is_pull ? c->pushfd : c->pullfd);
free(c);
}

42
deps/coupling/coupling.h
View File

@ -1,42 +0,0 @@
/* Copyright (c) 2009 Ryan Dahl (ry@tinyclouds.org)
*
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef coupling_h
#define coupling_h
#ifdef __cplusplus
extern "C" {
#endif
struct coupling;
struct coupling* coupling_new_pull (int fd);
struct coupling* coupling_new_push (int fd);
int coupling_nonblocking_fd (struct coupling*);
void coupling_join (struct coupling*);
void coupling_destroy (struct coupling*);
#ifdef __cplusplus
}
#endif
#endif

73
deps/coupling/test.c
View File

@ -1,73 +0,0 @@
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <sys/select.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include "coupling.h"
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define CHUNKSIZE 44231
int
main (int argc, char *argv[])
{
struct coupling *c = coupling_new_push(STDERR_FILENO);
int stderr_fd = coupling_nonblocking_fd(c);
int size;
if (argc == 2) {
size = atoi(argv[1]);
printf("size = %d\n", size);
} else {
printf("usage: ./test 123 2> stderr; wc -c stderr\n");
exit(1);
}
char *msg = malloc(CHUNKSIZE);
int i, r;
for (i = 0; i < CHUNKSIZE; i++) {
msg[i] = 'A' + i % 26;
}
int written = 0;
fd_set writefds, exceptfds;
FD_ZERO(&exceptfds);
FD_SET(stderr_fd, &exceptfds);
FD_ZERO(&writefds);
FD_SET(stderr_fd, &writefds);
while (written < size) {
r = select(stderr_fd+1, NULL, &writefds, &exceptfds, NULL);
if (r < 0) {
printf("test.c select(): %s\n", strerror(errno));
exit(1);
}
if (FD_ISSET(stderr_fd, &exceptfds)) {
printf("exception on stderr fd\n");
exit(1);
}
if (FD_ISSET(stderr_fd, &writefds)) {
r = write(stderr_fd, msg, MIN(size - written, CHUNKSIZE));
if (r < 0 && errno != EAGAIN) {
printf("test.c write(): %s\n", strerror(errno));
exit(1);
} else {
written += r;
printf("%d\n", written);
}
}
}
close(stderr_fd);
coupling_join(c);
coupling_destroy(c);
return 0;
}

16
wscript
View File

@ -294,16 +294,6 @@ def build(bld):
if bld.env["USE_DEBUG"]:
http_parser.clone("debug")
### coupling
coupling = bld.new_task_gen("cc")
coupling.source = "deps/coupling/coupling.c"
coupling.includes = "deps/coupling/"
coupling.name = "coupling"
coupling.target = "coupling"
coupling.install_path = None
if bld.env["USE_DEBUG"]:
coupling.clone("debug")
### src/native.cc
def make_macros(loc, content):
f = open(loc, 'w')
@ -387,13 +377,12 @@ def build(bld):
deps/c-ares
deps/libeio
deps/http_parser
deps/coupling
"""
node.includes += ' deps/c-ares/' + bld.env['DEST_OS'] + '-' + bld.env['DEST_CPU']
node.add_objects = 'cares ev eio http_parser coupling'
node.add_objects = 'cares ev eio http_parser'
node.uselib_local = ''
node.uselib = 'RT OPENSSL V8 EXECINFO DL KVM SOCKET NSL'
else:
@ -401,9 +390,8 @@ def build(bld):
src/
deps/libeio
deps/http_parser
deps/coupling
"""
node.add_objects = 'eio http_parser coupling'
node.add_objects = 'eio http_parser'
node.uselib_local = 'eio'
node.uselib = 'RT EV OPENSSL CARES V8 EXECINFO DL KVM SOCKET NSL'

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