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asyncreq.c
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asyncreq.c
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/*******************************************************************************
* Copyright (c) 2007, 2009 Wind River Systems, Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v1.0 which accompany this distribution.
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
#include "config.h"
#include <assert.h>
#include <stddef.h>
#if defined(WIN32)
#elif defined(_WRS_KERNEL)
#else
# include <sys/wait.h>
#endif
#include "myalloc.h"
#include "trace.h"
#include "events.h"
#include "link.h"
#include "asyncreq.h"
#include "errors.h"
static LINK wtlist;
static pthread_mutex_t wtlock;
typedef struct WorkerThread {
LINK wtlink;
AsyncReqInfo * req;
pthread_cond_t cond;
pthread_t thread;
} WorkerThread;
#define wtlink2wt(A) ((WorkerThread *)((char *)(A) - offsetof(WorkerThread, wtlink)))
static void * worker_thread_handler(void * x) {
WorkerThread * wt = x;
for (;;) {
AsyncReqInfo * req = wt->req;
assert(req != NULL);
req->error = 0;
switch(req->type) {
case AsyncReqRead: /* File read */
req->u.fio.rval = read(req->u.fio.fd, req->u.fio.bufp, req->u.fio.bufsz);
if (req->u.fio.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
case AsyncReqWrite: /* File write */
req->u.fio.rval = write(req->u.fio.fd, req->u.fio.bufp, req->u.fio.bufsz);
if (req->u.fio.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
case AsyncReqSeekRead: /* File read at offset */
req->u.fio.rval = pread(req->u.fio.fd, req->u.fio.bufp, req->u.fio.bufsz, req->u.fio.offset);
if (req->u.fio.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
case AsyncReqSeekWrite: /* File write at offset */
req->u.fio.rval = pwrite(req->u.fio.fd, req->u.fio.bufp, req->u.fio.bufsz, req->u.fio.offset);
if (req->u.fio.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
case AsyncReqRecv: /* Socket recv */
req->u.sio.rval = recv(req->u.sio.sock, req->u.sio.bufp, req->u.sio.bufsz, req->u.sio.flags);
if (req->u.sio.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
case AsyncReqSend: /* Socket send */
req->u.sio.rval = send(req->u.sio.sock, req->u.sio.bufp, req->u.sio.bufsz, req->u.sio.flags);
if (req->u.sio.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
case AsyncReqRecvFrom: /* Socket recvfrom */
req->u.sio.rval = recvfrom(req->u.sio.sock, req->u.sio.bufp, req->u.sio.bufsz, req->u.sio.flags, req->u.sio.addr, &req->u.sio.addrlen);
if (req->u.sio.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
case AsyncReqSendTo: /* Socket sendto */
req->u.sio.rval = sendto(req->u.sio.sock, req->u.sio.bufp, req->u.sio.bufsz, req->u.sio.flags, req->u.sio.addr, req->u.sio.addrlen);
if (req->u.sio.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
case AsyncReqAccept: /* Accept socket connections */
req->u.acc.rval = accept(req->u.acc.sock, req->u.acc.addr, req->u.acc.addr ? &req->u.acc.addrlen : NULL);
if (req->u.acc.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
case AsyncReqConnect: /* Connect to socket */
req->u.acc.rval = connect(req->u.con.sock, req->u.con.addr, req->u.con.addrlen);
if (req->u.con.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
/* Platform dependant IO methods */
#if defined(WIN32)
#elif defined(_WRS_KERNEL)
#else
case AsyncReqWaitpid: /* Wait for process change */
req->u.wpid.rval = waitpid(req->u.wpid.pid, &req->u.wpid.status, req->u.wpid.options);
if (req->u.con.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
#endif
case AsyncReqSelect:
{
struct timeval tv;
tv.tv_sec = (long)req->u.select.timeout.tv_sec;
tv.tv_usec = req->u.select.timeout.tv_nsec / 1000;
req->u.select.rval = select(req->u.select.nfds, &req->u.select.readfds,
&req->u.select.writefds, &req->u.select.errorfds, &tv);
if (req->u.con.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
}
case AsyncReqClose:
req->u.fio.rval = close(req->u.fio.fd);
if (req->u.fio.rval == -1) {
req->error = errno;
assert(req->error);
}
break;
default:
req->error = ENOSYS;
break;
}
trace(LOG_ASYNCREQ, "async_req_complete: req %p, type %d, error %d", req, req->type, req->error);
check_error(pthread_mutex_lock(&wtlock));
/* Post event inside lock to make sure a new worker thread is
* not created unnecessarily */
post_event(req->done, req);
wt->req = NULL;
list_add_last(&wt->wtlink, &wtlist);
for (;;) {
check_error(pthread_cond_wait(&wt->cond, &wtlock));
if (wt->req != NULL) break;
}
check_error(pthread_mutex_unlock(&wtlock));
}
}
#if ENABLE_AIO
static void aio_done(sigval_t arg) {
AsyncReqInfo * req = arg.sival_ptr;
req->u.fio.rval = aio_return(&req->u.fio.aio);
if (req->u.fio.rval < 0) req->error = aio_error(&req->u.fio.aio);
post_event(req->done, req);
}
#endif
void async_req_post(AsyncReqInfo * req) {
WorkerThread * wt;
trace(LOG_ASYNCREQ, "async_req_post: req %p, type %d", req, req->type);
#if ENABLE_AIO
{
int res = 0;
switch (req->type) {
case AsyncReqSeekRead:
case AsyncReqSeekWrite:
memset(&req->u.fio.aio, 0, sizeof(req->u.fio.aio));
req->u.fio.aio.aio_fildes = req->u.fio.fd;
req->u.fio.aio.aio_offset = req->u.fio.offset;
req->u.fio.aio.aio_buf = req->u.fio.bufp;
req->u.fio.aio.aio_nbytes = req->u.fio.bufsz;
req->u.fio.aio.aio_sigevent.sigev_notify = SIGEV_THREAD;
req->u.fio.aio.aio_sigevent.sigev_notify_function = aio_done;
req->u.fio.aio.aio_sigevent.sigev_value.sival_ptr = req;
res = req->type == AsyncReqSeekWrite ?
aio_write(&req->u.fio.aio) :
aio_read(&req->u.fio.aio);
if (res < 0) {
req->u.fio.rval = -1;
req->error = errno;
post_event(req->done, req);
}
return;
}
}
#endif
check_error(pthread_mutex_lock(&wtlock));
if (list_is_empty(&wtlist)) {
int error;
wt = loc_alloc_zero(sizeof *wt);
check_error(pthread_cond_init(&wt->cond, NULL));
wt->req = req;
error = pthread_create(&wt->thread, &pthread_create_attr, worker_thread_handler, wt);
if (error) {
trace(LOG_ALWAYS, "Can't create a worker thread: %d %s", error, errno_to_str(error));
loc_free(wt);
req->error = error;
post_event(req->done, req);
}
}
else {
wt = wtlink2wt(wtlist.next);
list_remove(&wt->wtlink);
assert(wt->req == NULL);
wt->req = req;
check_error(pthread_cond_signal(&wt->cond));
}
check_error(pthread_mutex_unlock(&wtlock));
}
void ini_asyncreq(void) {
list_init(&wtlist);
check_error(pthread_mutex_init(&wtlock, NULL));
}