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cmselect.c
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cmselect.c
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/***** Includes *****/
#include "config.h"
#include <sys/types.h>
#ifdef HAVE_WINDOWS_H
#ifndef FD_SETSIZE
#define FD_SETSIZE 1024
#endif
#include <winsock2.h>
#include <windows.h>
#include <sys/timeb.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_TIMES_H
#include <sys/times.h>
#endif
#include <sys/socket.h>
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#ifdef HAVE_HOSTLIB_H
#include "hostLib.h"
#endif
#ifdef HAVE_STREAMS_UN_H
#include <streams/un.h>
#endif
#include <netinet/in.h>
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#endif
#include <stdio.h>
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#define assert(e) \
((void) ((e) ? 0 : __assert (#e, __FILE__, __LINE__)))
#define __assert(e, file, line) \
((void)printf ("%s:%u: failed assertion `%s'\n", file, line, e), abort())
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif
#ifdef HAVE_SCHED_H
#include <sched.h>
#endif
#include <atl.h>
#include "evpath.h"
#include "cm_transport.h"
#include "cm_internal.h"
#include "ev_select.h"
#ifdef _MSC_VER
#define getpid() _getpid()
#define close(x) closesocket(x)
#endif
#undef realloc
#undef malloc
extern void*
select_realloc(void* ptr, size_t size)
{
void* tmp = realloc(ptr, size);
if ((tmp == 0) && (size != 0)) {
printf("Realloc failed on ptr %p, size %zd\n", ptr, size);
perror("realloc");
}
return tmp;
}
extern void*
select_malloc(size_t size)
{
void* tmp = malloc(size);
if ((tmp == 0) && (size != 0)) {
printf("Malloc failed on size %zd\n", size);
perror("malloc");
}
return tmp;
}
#define realloc(ptr, size) select_realloc(ptr, size)
#define malloc(size) select_malloc(size)
#ifndef SOCKET_ERROR
#define SOCKET_ERROR -1
#endif
#if defined (__INTEL_COMPILER)
# pragma warning (disable: 869)
# pragma warning (disable: 310)
# pragma warning (disable: 1418)
# pragma warning (disable: 180)
# pragma warning (disable: 177)
#endif
typedef struct func_list_item {
select_list_func func;
void *arg1;
void *arg2;
} FunctionListElement;
typedef struct select_data {
thr_thread_id server_thread;
void *fdset; /* bitmap of the fds for read select */
void *write_set; /* bitmap of the fds for write select */
int sel_item_max;
FunctionListElement *select_items;
FunctionListElement *write_items;
periodic_task_handle periodic_task_list;
int closed;
CManager cm;
int select_consistency_number;
SOCKET wake_read_fd;
SOCKET wake_write_fd;
} *select_data_ptr;
static void wake_server_thread(select_data_ptr socket_data);
static void setup_wake_mechanism(CMtrans_services svcs,
select_data_ptr *sdp);
static int remove_periodic_task(select_data_ptr sd,
periodic_task_handle handle);
#ifdef HAVE_WINDOWS_H
/* Winsock init stuff */
/* ask for ver 1.1 */
static WORD wVersionRequested = MAKEWORD(1, 1);
static WSADATA wsaData;
int nErrorStatus;
static char*WSAerror_str(int err);
#ifndef FD_SETSIZE
#define FD_SETSIZE 1024
#endif
#endif
static void
init_select_data(CMtrans_services svc, select_data_ptr *sdp, CManager cm)
{
select_data_ptr sd = malloc(sizeof(struct select_data));
*sdp = sd;
sd->fdset = svc->malloc_func(sizeof(fd_set));
EVPATH_FD_ZERO((fd_set *) sd->fdset);
sd->write_set = svc->malloc_func(sizeof(fd_set));
EVPATH_FD_ZERO((fd_set *) sd->write_set);
sd->server_thread = (thr_thread_id)(intptr_t) NULL;
sd->closed = 0;
sd->sel_item_max = 0;
sd->select_items = (FunctionListElement *) svc->malloc_func(sizeof(FunctionListElement));
sd->select_items[0].func = NULL;
sd->select_items[0].arg1 = NULL;
sd->select_items[0].arg2 = NULL;
sd->write_items = (FunctionListElement *) svc->malloc_func(sizeof(FunctionListElement));
sd->write_items[0].func = NULL;
sd->write_items[0].arg1 = NULL;
sd->write_items[0].arg2 = NULL;
sd->periodic_task_list = NULL;
sd->select_consistency_number = 0;
sd->wake_read_fd = -1;
sd->wake_write_fd = -1;
if (cm != NULL) {
sd->cm = cm;
}
setup_wake_mechanism(svc, sdp);
}
typedef struct _periodic_task {
int period_sec;
int period_usec;
thr_thread_id executing;
struct timeval next_time;
select_list_func func;
void *arg1;
void *arg2;
periodic_task_handle next;
} task_handle_s;
static void
free_select_data(CMtrans_services svc, select_data_ptr *sdp)
{
periodic_task_handle tasks;
select_data_ptr sd = *sdp;
*sdp = NULL;
tasks = sd->periodic_task_list;
svc->free_func(sd->fdset);
svc->free_func(sd->write_set);
svc->free_func(sd->select_items);
svc->free_func(sd->write_items);
while (tasks != NULL) {
periodic_task_handle next = tasks->next;
svc->free_func(tasks);
tasks = next;
}
svc->free_func(sd);
}
#undef timercmp
#define timercmp(tvp, uvp, cmp) \
/* CSTYLED */ \
(((tvp)->tv_sec cmp (uvp)->tv_sec) || \
((((tvp)->tv_sec == (uvp)->tv_sec) && \
/* CSTYLED */ \
((tvp)->tv_usec cmp (uvp)->tv_usec))))
static void
set_soonest_timeout(struct timeval *timeout, periodic_task_handle task_list, struct timeval now)
{
struct timeval this_delay;
if (task_list == NULL) return;
this_delay.tv_sec = task_list->next_time.tv_sec - now.tv_sec;
this_delay.tv_usec = task_list->next_time.tv_usec - now.tv_usec;
if (task_list->executing == (thr_thread_id)-1) {
/* this task not executing already, see when it needs to run */
if (this_delay.tv_usec < 0) {
this_delay.tv_sec--;
this_delay.tv_usec += 1000000;
}
if (this_delay.tv_sec < 0) {
this_delay.tv_sec = this_delay.tv_usec = 0;
}
if ((timeout->tv_sec == -1) || (timercmp(&this_delay, timeout, <))) {
*timeout = this_delay;
}
}
set_soonest_timeout(timeout, task_list->next, now);
}
static void
increment_time(struct timeval *time, int increment_sec, int increment_usec)
{
time->tv_usec += increment_usec;
time->tv_sec += increment_sec;
if (time->tv_usec >= 1000000) {
time->tv_sec += (time->tv_usec / 1000000);
time->tv_usec = (time->tv_usec % 1000000);
}
}
static void
shutdown_wake_mechanism(select_data_ptr sd);
static void
socket_select(CMtrans_services svc, select_data_ptr sd, int timeout_sec, int timeout_usec)
{
int i, res;
fd_set rd_set, wr_set;
struct timeval timeout;
int tmp_select_consistency_number = sd->select_consistency_number;
if (sd->closed) {
sd->server_thread = (thr_thread_id)(intptr_t) NULL;
return;
}
if (sd->cm) {
/* assert CM is locked */
assert(CM_LOCKED(svc, sd->cm));
}
if (sd->server_thread == (thr_thread_id)(intptr_t) NULL) {
/* no server thread set, must be this one */
sd->server_thread = thr_thread_self();
}
if (sd->server_thread != thr_thread_self()) {
/* What? We're polling, but we're not the server thread? */
fprintf(stderr, "Warning: Multiple threads calling CManager_socket_select.\n");
fprintf(stderr, " This situation may result in unexpected I/O blocking.\n");
fprintf(stderr, " Server thread set to %lx.\n", (long) thr_thread_self());
sd->server_thread = thr_thread_self();
}
rd_set = *(fd_set *) sd->fdset;
wr_set = *(fd_set *) sd->write_set;
if ((timeout_sec >= 0) || (sd->periodic_task_list != NULL)) {
struct timeval now;
#ifndef HAVE_WINDOWS_H
gettimeofday(&now, NULL);
#else
/* GSE... No gettimeofday on windows.
* Must use _ftime, get millisec time, convert to usec. Bleh.
*/
struct _timeb nowb;
_ftime(&nowb);
now.tv_sec = (long)nowb.time;
now.tv_usec = nowb.millitm * 1000;
#endif
if (timeout_usec >= 1000000) {
timeout_sec += (timeout_usec / 1000000);
timeout_usec = timeout_usec % 1000000;
}
timeout.tv_sec = timeout_sec;
timeout.tv_usec = timeout_usec;
set_soonest_timeout(&timeout, sd->periodic_task_list, now);
svc->verbose(sd->cm, CMSelectVerbose, "CMSelect with timeout %d sec, %d usec",
timeout.tv_sec, timeout.tv_usec);
if (timeout.tv_sec == -1) {
timeout.tv_usec = 1;
timeout.tv_sec = 0;
}
DROP_CM_LOCK(svc, sd->cm);
res = select(sd->sel_item_max+1, &rd_set, &wr_set,
(fd_set *) NULL, &timeout);
ACQUIRE_CM_LOCK(svc, sd->cm);
} else {
int max = sd->sel_item_max;
svc->verbose(sd->cm, CMSelectVerbose, "CMSelect blocking select");
DROP_CM_LOCK(svc, sd->cm);
res = select(max+1, &rd_set, &wr_set, (fd_set *) NULL, NULL);
ACQUIRE_CM_LOCK(svc, sd->cm);
}
if (sd->closed) {
sd->server_thread = (thr_thread_id)(intptr_t) NULL;
return;
}
#ifndef HAVE_WINDOWS_H
if (res == -1) {
if (errno == EINTR) {
return;
}
/*
* if upon returning from select the consistency number
* has changed, the only safe thing to do is return so
* that a new select can happen with consistent info.
*/
if (sd->select_consistency_number !=
tmp_select_consistency_number) return;
if (errno == 0) {
/*
* odd, but x86 Solaris seems to return -1 from select but not set
* the errno in some circumstances. Just return when this happens.
*/
return;
}
if (errno == EBADF) {
int j;
int found_one = 0;
for (j = 0; j < FD_SETSIZE; j++) {
if (FD_ISSET(j, &rd_set)) {
fd_set test_set;
timeout.tv_usec = 0;
timeout.tv_sec = 0;
EVPATH_FD_ZERO(&test_set);
FD_SET(j, &test_set);
errno = 0;
select(sd->sel_item_max+1, &test_set, (fd_set *) NULL,
(fd_set *) NULL, &timeout);
if (errno == EBADF) {
fprintf(stderr, "Select failed, fd %d is bad. Removing from select list.\n",
j);
FD_CLR(j, (fd_set *) sd->fdset);
FD_CLR(j, (fd_set *) sd->write_set);
found_one++;
FD_CLR(j, &rd_set);
}
}
}
if (sd->closed) {
sd->server_thread = (thr_thread_t) NULL;
return;
}
/* if (found_one == 0) { fprintf(stderr, "Bad file descriptor in select
* Warning. Failed to localize.\n"); } */
} else if (errno != EAGAIN) {
#ifdef HAVE_FDS_BITS
fprintf(stderr, "select failed, errno %d, rd_set was %lx, %lx,%lx, %lx\n\n", errno,
(long) ((fd_set *) sd->fdset)->fds_bits[0],
(long) ((fd_set *) sd->fdset)->fds_bits[1],
(long) ((fd_set *) sd->fdset)->fds_bits[2],
(long) ((fd_set *) sd->fdset)->fds_bits[3]);
fprintf(stderr, "timeout was %d and %d\n", timeout_sec, timeout_usec);
#else
fprintf(stderr, "select failed, errno %d\n", errno);
#endif
exit(1);
return;
}
}
#else
/*
* Have to ignore the bad invalue for select on NT because it can't
* do selects on files. Otherwise you will get a bunch of
* irritating select errors that aren't really errors
*/
if (res == SOCKET_ERROR) {
int errno_val;
errno_val = WSAGetLastError();
if (errno_val == WSAEINTR || errno_val == WSAEINVAL) {
return;
} else {
fprintf(stderr, "select failed, errno %s\n",
WSAerror_str(errno_val));
}
return;
}
#endif
#ifdef HAVE_FDS_BITS
svc->verbose(sd->cm, CMSelectVerbose, "select returned, rd_set started %lx, %lx, %lx, %lx, result was %lx, %lx, %lx, %lx",
(long) ((fd_set *) sd->fdset)->fds_bits[0],
(long) ((fd_set *) sd->fdset)->fds_bits[1],
(long) ((fd_set *) sd->fdset)->fds_bits[2],
(long) ((fd_set *) sd->fdset)->fds_bits[3],
(long) ((fd_set *) &rd_set)->fds_bits[0],
(long) ((fd_set *) &rd_set)->fds_bits[1],
(long) ((fd_set *) &rd_set)->fds_bits[2],
(long) ((fd_set *) &rd_set)->fds_bits[3]);
svc->verbose(sd->cm, CMSelectVerbose, " write_set started %lx, %lx, %lx, %lx, result was %lx, %lx, %lx, %lx",
(long) ((fd_set *) sd->write_set)->fds_bits[0],
(long) ((fd_set *) sd->write_set)->fds_bits[1],
(long) ((fd_set *) sd->write_set)->fds_bits[2],
(long) ((fd_set *) sd->write_set)->fds_bits[3],
(long) ((fd_set *) &wr_set)->fds_bits[0],
(long) ((fd_set *) &wr_set)->fds_bits[1],
(long) ((fd_set *) &wr_set)->fds_bits[2],
(long) ((fd_set *) &wr_set)->fds_bits[3]);
#endif
/*
* if upon returning from select the consistency number
* has changed, the only safe thing to do is return so
* that a new select can happen with consistent info.
*/
if (sd->select_consistency_number !=
tmp_select_consistency_number) return;
/*
* Careful! We're reading the control list here without locking!
* Something bad *might* happen, it's just unlikely.
*/
if (res != 0) {
for (i = 0; i <= sd->sel_item_max; i++) {
if (sd->closed) {
sd->server_thread = (thr_thread_id)(intptr_t) NULL;
return;
}
if (FD_ISSET(i, &wr_set)) {
if (sd->write_items[i].func != NULL) {
svc->verbose(sd->cm, CMSelectVerbose,
"Running select write action on fd %d",
i);
sd->write_items[i].func(sd->write_items[i].arg1,
sd->write_items[i].arg2);
} else {
assert(!FD_ISSET(i, (fd_set *)sd->write_set));
}
if (sd->select_consistency_number !=
tmp_select_consistency_number) return;
}
if (FD_ISSET(i, &rd_set)) {
if (sd->select_items[i].func != NULL) {
svc->verbose(sd->cm, CMSelectVerbose,
"Running select read action on fd %d",
i);
sd->select_items[i].func(sd->select_items[i].arg1,
sd->select_items[i].arg2);
} else {
if(FD_ISSET(i, (fd_set *)sd->fdset)) {
printf("FD %d is set in rd_set without being in fdset\n", i);
assert(FALSE);
}
}
if (sd->select_consistency_number !=
tmp_select_consistency_number) return;
}
}
}
if (sd->periodic_task_list != NULL) {
/* handle periodic tasks */
periodic_task_handle this_periodic_task = sd->periodic_task_list;
struct timeval now;
#ifndef HAVE_WINDOWS_H
gettimeofday(&now, NULL);
#else
/* GSE... No gettimeofday on windows.
* Must use _ftime, get millisec time, convert to usec. Bleh.
*/
struct _timeb nowb;
_ftime(&nowb);
now.tv_sec = (long) nowb.time;
now.tv_usec = nowb.millitm * 1000;
#endif
while (this_periodic_task != NULL ) {
periodic_task_handle next = this_periodic_task->next;
if (timercmp(&now, &this_periodic_task->next_time, >)) {
increment_time(&this_periodic_task->next_time,
this_periodic_task->period_sec,
this_periodic_task->period_usec);
if (this_periodic_task->executing == (thr_thread_id)-1) {
this_periodic_task->executing = thr_thread_self();
DROP_CM_LOCK(svc, sd->cm);
this_periodic_task->func(this_periodic_task->arg1,
this_periodic_task->arg2);
ACQUIRE_CM_LOCK(svc, sd->cm);
next = this_periodic_task->next;
this_periodic_task->executing = (thr_thread_id) -1;
if ((this_periodic_task->period_sec == 0) &&
(this_periodic_task->period_usec == 0)) {
remove_periodic_task(sd, this_periodic_task);
}
}
if (sd->closed) {
shutdown_wake_mechanism(sd);
return;
}
}
/*
* if upon returning from a handler the consistency number
* has changed, the only safe thing to do is return so
* that a new select can happen with consistent info.
*/
if (sd->select_consistency_number !=
tmp_select_consistency_number) return;
this_periodic_task = next;
}
}
sd->select_consistency_number++;
}
extern void
libcmselect_LTX_add_select(CMtrans_services svc, select_data_ptr *sdp, int fd, select_list_func func, void *arg1, void *arg2)
{
select_data_ptr sd = *((select_data_ptr *)sdp);
if (sd->cm) {
/* assert CM is locked */
assert(CM_LOCKED(svc, sd->cm));
}
if (sd == NULL) {
init_select_data(svc, (select_data_ptr*)sdp, (CManager)NULL);
sd = *((select_data_ptr *)sdp);
}
sd->select_consistency_number++;
if (fd > sd->sel_item_max) {
int i;
int size = (fd+1)*sizeof(sd->select_items[0]);
sd->write_items =
(FunctionListElement *) svc->realloc_func(sd->write_items, size);
sd->select_items =
(FunctionListElement *) svc->realloc_func(sd->select_items, size);
if ((sd->select_items == NULL) || (sd->write_items == NULL)) {
perror("Realloc failed\n");
exit(1);
}
for (i = sd->sel_item_max + 1; i <= fd; i++) {
sd->write_items[i].func = NULL;
sd->write_items[i].arg1 = NULL;
sd->write_items[i].arg2 = NULL;
sd->select_items[i].func = NULL;
sd->select_items[i].arg1 = NULL;
sd->select_items[i].arg2 = NULL;
}
sd->sel_item_max = fd;
}
FD_SET(fd, (fd_set *) sd->fdset);
if (fd > FD_SETSIZE) {
fprintf(stderr, "The file descriptor number (%d) has exceeded the capability of select() on this system\n", fd);
#ifndef HAVE_WINDOWS_H
fprintf(stderr, "Increase FD_SETSIZE if possible.\n");
#else
fprintf(stderr, "Try running with a different control module if possible\n");
#endif
fprintf(stderr, "Item not added to fdset.\n");
}
svc->verbose(sd->cm, CMSelectVerbose, "Adding fd %d to select read list", fd);
sd->select_items[fd].func = func;
sd->select_items[fd].arg1 = arg1;
sd->select_items[fd].arg2 = arg2;
wake_server_thread(sd);
}
extern void
libcmselect_LTX_write_select(CMtrans_services svc, select_data_ptr *sdp, int fd, select_list_func func, void *arg1, void *arg2)
{
select_data_ptr sd = *((select_data_ptr *)sdp);
if (sd == NULL) {
init_select_data(svc, (select_data_ptr*)sdp, (CManager)NULL);
sd = *((select_data_ptr *)sdp);
}
if (sd->cm) {
/* assert CM is locked */
assert(CM_LOCKED(svc, sd->cm));
}
sd->select_consistency_number++;
if (fd > sd->sel_item_max) {
int i;
int size = (fd+1)*sizeof(sd->select_items[0]);
sd->select_items =
(FunctionListElement *) svc->realloc_func(sd->select_items, size);
sd->write_items =
(FunctionListElement *) svc->realloc_func(sd->write_items, size);
if ((sd->select_items == NULL) || (sd->write_items == NULL)) {
perror("Realloc failed\n");
exit(1);
}
for (i = sd->sel_item_max + 1; i <= fd; i++) {
sd->write_items[i].func = NULL;
sd->write_items[i].arg1 = NULL;
sd->write_items[i].arg2 = NULL;
sd->select_items[i].func = NULL;
sd->select_items[i].arg1 = NULL;
sd->select_items[i].arg2 = NULL;
}
sd->sel_item_max = fd;
}
if (func != NULL) {
svc->verbose(sd->cm, CMSelectVerbose, "Adding fd %d to select write list", fd);
FD_SET(fd, (fd_set *) sd->write_set);
} else {
svc->verbose(sd->cm, CMSelectVerbose, "Removing fd %d to select write list", fd);
FD_CLR(fd, (fd_set *) sd->write_set);
}
if (fd > FD_SETSIZE) {
fprintf(stderr, "The file descriptor number (%d) has exceeded the capability of select() on this system\n", fd);
#ifndef HAVE_WINDOWS_H
fprintf(stderr, "Increase FD_SETSIZE if possible.\n");
#else
fprintf(stderr, "Try running with a different control module if possible\n");
#endif
fprintf(stderr, "Item not added to fdset.\n");
}
sd->write_items[fd].func = func;
sd->write_items[fd].arg1 = arg1;
sd->write_items[fd].arg2 = arg2;
wake_server_thread(sd);
}
extern periodic_task_handle
libcmselect_LTX_add_periodic(CMtrans_services svc, select_data_ptr *sdp, int interval_sec, int interval_usec, select_list_func func, void *arg1, void *arg2)
{
select_data_ptr sd = *((select_data_ptr *)sdp);
periodic_task_handle handle = malloc(sizeof(struct _periodic_task));
if (sd == NULL) {
init_select_data(svc, (select_data_ptr*)sdp, (CManager)NULL);
sd = *((select_data_ptr *)sdp);
}
if (sd->cm) {
/* assert CM is locked */
assert(CM_LOCKED(svc, sd->cm));
}
handle->period_sec = interval_sec;
handle->period_usec = interval_usec;
handle->executing = (thr_thread_id) -1;
#ifndef HAVE_WINDOWS_H
gettimeofday(&handle->next_time, NULL);
#else
/* GSE... No gettimeofday on windows.
* Must use _ftime, get millisec time, convert to usec. Bleh.
*/
{
struct _timeb nowb;
_ftime(&nowb);
handle->next_time.tv_sec = (long)nowb.time;
handle->next_time.tv_usec = nowb.millitm * 1000;
}
#endif
increment_time(&handle->next_time, interval_sec, interval_usec);
handle->func = func;
handle->arg1 = arg1;
handle->arg2 = arg2;
handle->next = NULL;
if (sd->periodic_task_list == NULL) {
sd->periodic_task_list = handle;
} else {
handle->next = sd->periodic_task_list;
sd->periodic_task_list = handle;
}
wake_server_thread(sd);
return handle;
}
extern periodic_task_handle
libcmselect_LTX_add_delayed_task(CMtrans_services svc, select_data_ptr *sdp, int delay_sec, int delay_usec, select_list_func func, void *arg1, void *arg2)
{
select_data_ptr sd = *((select_data_ptr *)sdp);
periodic_task_handle handle = malloc(sizeof(struct _periodic_task));
if (sd == NULL) {
init_select_data(svc, (select_data_ptr*)sdp, (CManager)NULL);
sd = *((select_data_ptr *)sdp);
}
if (sd->cm) {
/* assert CM is locked */
assert(CM_LOCKED(svc, sd->cm));
}
handle->period_sec = 0;
handle->period_usec = 0;
handle->executing = (thr_thread_id) -1;
#ifndef HAVE_WINDOWS_H
gettimeofday(&handle->next_time, NULL);
#else
{
/* GSE... No gettimeofday on windows.
* Must use _ftime, get millisec time, convert to usec. Bleh.
*/
struct _timeb nowb;
_ftime(&nowb);
handle->next_time.tv_sec = (long)nowb.time;
handle->next_time.tv_usec = (long)(nowb.millitm * 1000);
}
#endif
increment_time(&handle->next_time, delay_sec, delay_usec);
handle->func = func;
handle->arg1 = arg1;
handle->arg2 = arg2;
handle->next = NULL;
if (sd->periodic_task_list == NULL) {
sd->periodic_task_list = handle;
} else {
handle->next = sd->periodic_task_list;
sd->periodic_task_list = handle;
}
wake_server_thread(sd);
return handle;
}
static int
remove_periodic_task(select_data_ptr sd, periodic_task_handle handle)
{
periodic_task_handle list, last = NULL;
list = sd->periodic_task_list;
while(list != handle) {
last = list;
list = list->next;
if (list == NULL) {
return 0;
}
}
/* unlink task */
if (last == NULL) {
sd->periodic_task_list = list->next;
} else {
last->next = list->next;
}
if (handle->executing != thr_thread_self()) {
/* someone besides us executing this ? */
int i = 0;
while (handle->executing != (thr_thread_id)-1) {
/* wait until they're done */
thr_thread_yield();
i++;
if (i > 1000) {
/* give up */
continue;
}
}
}
free(handle);
sd->select_consistency_number++;
return 1;
}
extern void
libcmselect_LTX_remove_periodic(CMtrans_services svc, select_data_ptr *sdp, periodic_task_handle handle)
{
select_data_ptr sd = *((select_data_ptr *)sdp);
if (sd == NULL) return;
if (remove_periodic_task(sd, handle) == 0) {
fprintf(stderr, "Periodic task not found for removal\n");
}
}
extern void
libcmselect_LTX_remove_select(CMtrans_services svc, select_data_ptr *sdp, int fd)
{
select_data_ptr sd = *((select_data_ptr *)sdp);
if (sd == NULL) {
init_select_data(svc, (select_data_ptr*)sdp, (CManager)NULL);
sd = *((select_data_ptr *)sdp);
}
sd->select_consistency_number++;
FD_CLR(fd, (fd_set *) sd->fdset);
sd->select_items[fd].func = NULL;
sd->select_items[fd].arg1 = NULL;
sd->select_items[fd].arg2 = NULL;
wake_server_thread(sd);
}
static void
shutdown_wake_mechanism(select_data_ptr sd)
{
if (sd->wake_read_fd == -1) return;
close(sd->wake_read_fd);
close(sd->wake_write_fd);
sd->wake_read_fd = sd->wake_write_fd = -1;
}
static void read_wake_fd(void *fd_as_ptr, void *junk)
{
char buffer;
SOCKET fd = (SOCKET) (intptr_t)fd_as_ptr;
#ifdef HAVE_WINDOWS_H
recv(fd, &buffer, 1, 0);
#else
if (read(fd, &buffer, 1) != 1) {
perror("wake read failed\n");
}
#endif
}
#ifdef HAVE_WINDOWS_H
static char*
WSAerror_str(err)
int err;
{
switch(err) {
case WSAEINTR: return "WSAEINTR";
case WSAEBADF: return "WSAEBADF";
case WSAEACCES: return "WSAEACCES";
case WSAEFAULT: return "WSAEFAULT";
case WSAEINVAL: return "WSAEINVAL";
case WSAEMFILE: return "WSAEMFILE";
case WSAEWOULDBLOCK: return "WSAEWOULDBLOCK";
case WSAEINPROGRESS: return "WSAEINPROGRESS";
case WSAEALREADY: return "WSAEALREADY";
case WSAENOTSOCK: return "WSAENOTSOCK";
case WSAEDESTADDRREQ: return "WSAEDESTADDRREQ";
case WSAEMSGSIZE: return "WSAEMSGSIZE";
case WSAEPROTOTYPE: return "WSAEPROTOTYPE";
case WSAENOPROTOOPT: return "WSAENOPROTOOPT";
case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
case WSAEOPNOTSUPP: return "WSAEOPNOTSUPP";
case WSAEPFNOSUPPORT: return "WSAEPFNOSUPPORT";
case WSAEAFNOSUPPORT: return "WSAEAFNOSUPPORT";
case WSAEADDRINUSE: return "WSAEADDRINUSE";
case WSAEADDRNOTAVAIL: return "WSAEADDRNOTAVAIL";
case WSAENETDOWN: return "WSAENETDOWN";
case WSAENETUNREACH: return "WSAENETUNREACH";
case WSAENETRESET: return "WSAENETRESET";
case WSAECONNABORTED: return "WSAECONNABORTED";
case WSAECONNRESET: return "WSAECONNRESET";
case WSAENOBUFS: return "WSAENOBUFS";
case WSAEISCONN: return "WSAEISCONN";
case WSAENOTCONN: return "WSAENOTCONN";
case WSAESHUTDOWN: return "WSAESHUTDOWN";
case WSAETOOMANYREFS: return "WSAETOOMANYREFS";
case WSAETIMEDOUT: return "WSAETIMEDOUT";
case WSAECONNREFUSED: return "WSAECONNREFUSED";
case WSAELOOP: return "WSAELOOP";
case WSAENAMETOOLONG: return "WSAENAMETOOLONG";
case WSAEHOSTDOWN: return "WSAEHOSTDOWN";
case WSAEHOSTUNREACH: return "WSAEHOSTUNREACH";
case WSAENOTEMPTY: return "WSAENOTEMPTY";
case WSAEPROCLIM: return "WSAEPROCLIM";
case WSAEUSERS: return "WSAEUSERS";
case WSAEDQUOT: return "WSAEDQUOT";
case WSAESTALE: return "WSAESTALE";
case WSAEREMOTE: return "WSAEREMOTE";
case WSAEDISCON: return "WSAEDISCON";
case WSASYSNOTREADY: return "WSASYSNOTREADY";
case WSAVERNOTSUPPORTED: return "WSAVERNOTSUPPORTED";
case WSANOTINITIALISED: return "WSANOTINITIALISED";
default: return "Unknown Winsock error";
}
}
/*
* Note. Unfortunately, the _pipe() function on WinNT
* produces FDs that you can't use in select(). This ruins what we want
* this pipe for, which is to wake up a thread sleeping in select().
* So, we need to introduce a pipe function that returns two socket FDs.
* NT Sux.
*/
static int
pipe(SOCKET *filedes)
{
int length;
struct sockaddr_in sock_addr;
int sock_opt_val = 1;
SOCKET sock1, sock2, conn_sock;
unsigned long block = TRUE;
int delay_value = 1;
conn_sock = socket(AF_INET, SOCK_STREAM, 0);
if (conn_sock == SOCKET_ERROR) {
fprintf(stderr, "Cannot open INET socket\n");
return -1;
}
sock_addr.sin_family = PF_INET;
sock_addr.sin_addr.s_addr = INADDR_ANY;
sock_addr.sin_port = 0;
if (bind(conn_sock, (struct sockaddr *) &sock_addr,
sizeof sock_addr) == SOCKET_ERROR) {
fprintf(stderr, "Cannot bind INET socket\n");
return -1;
}
length = sizeof sock_addr;
if (getsockname(conn_sock, (struct sockaddr *) &sock_addr, &length) < 0) {
fprintf(stderr, "Cannot get socket name\n");
return -1;
}
/* begin listening for conns */
if (listen(conn_sock, FD_SETSIZE)) {
fprintf(stderr, "listen failed\n");
return -1;
}
/* send sock */
if ((sock1 = socket(AF_INET, SOCK_STREAM, 0)) == SOCKET_ERROR) {
return -1;
}
sock_addr.sin_addr.s_addr = 0x0100007f; /* loopback */
sock_addr.sin_family = PF_INET;
if (ioctlsocket(sock1, FIONBIO, &block) != 0) {
printf("ioctl failed\n");
}
if (connect(sock1, (struct sockaddr *) &sock_addr,
sizeof sock_addr) == SOCKET_ERROR) {
int err = WSAGetLastError();
if (err != WSAEWOULDBLOCK) {
printf("unexpected error from connect, %s\n", WSAerror_str(err));
}
}
if ((sock2 = accept(conn_sock, (struct sockaddr *) 0, (int *) 0)) == SOCKET_ERROR) {
int err = WSAGetLastError();
printf("err was %s\n", WSAerror_str(err));
}
setsockopt(sock2, IPPROTO_TCP, TCP_NODELAY, (char *) &delay_value,
sizeof(delay_value));
{
fd_set stXcptFDS,stWriteFDS;
struct timeval stTimeOut; /* for select() timeout (none) */
int wRet;
EVPATH_FD_ZERO((fd_set FAR*)&(stXcptFDS));
EVPATH_FD_ZERO((fd_set FAR*)&(stWriteFDS));
FD_SET(sock1, (fd_set FAR*)&(stWriteFDS));
FD_SET(sock1, (fd_set FAR*)&(stXcptFDS));
stTimeOut.tv_sec = 10;
stTimeOut.tv_usec = 0;
wRet = select(-1, NULL,
(fd_set FAR*)&(stWriteFDS),
(fd_set FAR*)&(stXcptFDS),
NULL);
if (wRet == SOCKET_ERROR) {
int err = WSAGetLastError();
printf("err was %s\n", WSAerror_str(err));
}
}
setsockopt(sock1, IPPROTO_TCP, TCP_NODELAY, (char *) &delay_value,
sizeof(delay_value));
filedes[0] = sock1;
filedes[1] = sock2;
return 0;
}
#endif
static void
setup_wake_mechanism(CMtrans_services svc, select_data_ptr *sdp)
{
SOCKET filedes[2];
select_data_ptr sd = *((select_data_ptr *)sdp);
if (sd->cm) {
/* assert CM is locked */
assert(CM_LOCKED(svc, sd->cm));
}
if (sd->wake_read_fd != -1) return;
if (pipe(&filedes[0]) != 0) {
perror("Pipe for wake not created. Wake mechanism inoperative.");
return;
}
sd->wake_read_fd = filedes[0];
sd->wake_write_fd = filedes[1];
svc->verbose(sd->cm, CMSelectVerbose, "CMSelect Adding read_wake_fd as action on fd %d",
sd->wake_read_fd);
libcmselect_LTX_add_select(svc, sdp, (int)sd->wake_read_fd, read_wake_fd,
(void*)(intptr_t)sd->wake_read_fd, NULL);
}
extern void
libcmselect_LTX_wake_function(CMtrans_services svc, select_data_ptr *sdp)
{
if (*sdp != NULL) {
wake_server_thread(*sdp);
}