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cm_control.c
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cm_control.c
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#include "config.h"
#include <stdio.h>
#include <string.h>
#undef NDEBUG
#include <assert.h>
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <ffs.h>
#include <atl.h>
#include "evpath.h"
#include "chr_time.h"
#include "cm_internal.h"
typedef struct _CMCondition {
CMCondition next;
int condition_num;
int waiting;
int signaled;
int failed;
thr_condition_t cond_condition;
CMConnection conn;
void *client_data;
} CMCondition_s;
static int cm_control_debug_flag = -1;
static void set_debug_flag(CManager cm)
{
(void)cm;
if (cm_control_debug_flag == -1) {
if (CMtrace_on(cm, CMLowLevelVerbose)) {
cm_control_debug_flag = 1;
} else {
cm_control_debug_flag = 0;
}
}
}
static CMCondition
CMCondition_find(CMControlList cl, int condition)
{
CMCondition next = cl->condition_list;
while (next != NULL) {
if (next->condition_num == condition) {
return next;
}
next = next->next;
}
fprintf(stderr, "Serious internal error. Use of condition %d, no longer in control list\n", condition);
return NULL;
}
extern int
INT_CMCondition_get(CManager cm, CMConnection conn)
{
CMControlList cl = cm->control_list;
CMCondition cond = INT_CMmalloc(sizeof(CMCondition_s));
set_debug_flag(cm);
cond->next = cl->condition_list;
cl->condition_list = cond;
cond->condition_num = cl->next_condition_num++;
cond->conn = conn;
if (cl->next_condition_num >= 0xffffff) {
/* recycle at (16 M - 1) [ Caution on number reuse ] */
cl->next_condition_num = 0;
}
cond->waiting = 0;
cond->signaled = 0;
cond->failed = 0;
if (conn && conn->closed) {
cond->failed = 1;
}
thr_condition_init(cond->cond_condition);
return cond->condition_num;
}
static void
CMCondition_trigger(CManager cm, CMCondition cond, CMControlList cl)
{
(void)cl;
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel Triggering CMcondition %d\n", cond->condition_num);
}
if (cond->waiting) {
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel Triggering CMcondition %d\n",
cond->condition_num);
}
thr_condition_signal(cond->cond_condition);
}
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel After trigger for CMcondition %d\n",
cond->condition_num);
}
}
extern void
CMconn_fail_conditions(CMConnection conn)
{
CMControlList cl = conn->cm->control_list;
CMCondition cond_list;
set_debug_flag(conn->cm);
cond_list = cl->condition_list;
while(cond_list != NULL) {
if (cond_list->conn == conn) {
cond_list->failed = 1;
CMCondition_trigger(conn->cm, cond_list, cl);
}
cond_list = cond_list->next;
}
if (cl->cond_polling) {
/* wake the server thread in case we're not him */
CMwake_server_thread(conn->cm);
}
}
extern void
INT_CMCondition_fail(CManager cm, int condition)
{
CMControlList cl = cm->control_list;
CMCondition cond = CMCondition_find(cl, condition);
if (!cond) return;
cond->failed = 1;
CMCondition_trigger(cm, cond, cm->control_list);
if (cl->cond_polling) {
/* wake the server thread in case we're not him */
CMwake_server_thread(cm);
}
}
void
CMCondition_destroy(CMControlList cl, int condition)
{
CMCondition cond = NULL, prev = NULL;
CMCondition next = NULL;
if (cl->condition_list) {
if (cl->condition_list->condition_num == condition) {
cond = cl->condition_list;
cl->condition_list = cl->condition_list->next;
} else {
prev = cl->condition_list;
next = cl->condition_list->next;
while (next != NULL) {
if (next->condition_num == condition) {
cond = next;
prev->next = next->next;
break;
}
prev = next;
next = next->next;
}
}
}
if (cond == NULL) {
fprintf(stderr, "Serious internal error. Use of condition %d, no longer in control list\n", condition);
} else {
/* free internal elements */
thr_condition_free(cond->cond_condition);
INT_CMfree(cond);
}
}
extern void
internal_condition_free(CMControlList cl)
{
while(cl->condition_list) {
CMCondition_destroy(cl, cl->condition_list->condition_num);
}
}
extern int
INT_CMCondition_has_signaled(CManager cm, int condition)
{
int retval;
CMCondition cond;
CMControlList cl = cm->control_list;
set_debug_flag(cm);
cond = CMCondition_find(cl, condition);
if (!cond) return -1;
retval = cond->signaled;
return retval;
}
extern int
INT_CMCondition_has_failed(CManager cm, int condition)
{
int retval;
CMCondition cond;
CMControlList cl = cm->control_list;
set_debug_flag(cm);
cond = CMCondition_find(cl, condition);
if (!cond) return -1;
retval = cond->failed;
return retval;
}
extern int
INT_CMCondition_wait(CManager cm, int condition)
{
CMCondition cond;
CMControlList cl = cm->control_list;
int result;
assert(CManager_locked(cm));
set_debug_flag(cm);
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel Waiting for CMcondition %d\n", condition);
}
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel locked cl\n");
}
cond = CMCondition_find(cl, condition);
if (cond == NULL) return -1;
if (cond->signaled) {
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMcondition %d already signalled\n", condition);
}
return 1;
}
if (cond->failed) {
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMcondition %d already failed\n", condition);
}
return 0;
}
cond->waiting++;
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel In condition wait, server thread = %p\n",
(void*)(intptr_t)cl->server_thread);
}
if (!cl->has_thread) {
if ((cl->server_thread == (thr_thread_id) 0) || (cl->server_thread == thr_thread_self())) {
cl->cond_polling = 1;
while (!(cond->signaled || cond->failed)) {
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel Polling for CMcondition %d\n", condition);
}
CMcontrol_list_wait(cl);
}
cl->cond_polling = 0;
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel after Polling for CMcondition %d\n", condition);
}
/* the poll and handle will set cl->server_thread, restore it */
cl->server_thread = (thr_thread_id) (intptr_t)NULL;
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel In condition wait, reset server thread = %lx\n",
(long)cl->server_thread);
}
} else {
/* some other thread is servicing the network here
hopefully they'll keep doing it */
/* some other thread is the server thread */
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel Waiting for CMcondition %d\n",
condition);
}
assert(CManager_locked(cm));
cm->locked--;
thr_condition_wait(cond->cond_condition, cm->exchange_lock);
cm->locked++;
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel After wait for CMcondition %d\n",
condition);
}
}
} else if (thr_thread_self() == cl->server_thread) {
/* we're the server thread */
cl->cond_polling = 1;
while (!(cond->signaled || cond->failed)) {
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel polling for CMcondition %d\n", condition);
}
CMcontrol_list_wait(cl);
if (cl->closed) cond->failed = 1;
}
cl->cond_polling = 0;
} else {
/* some other thread is the server thread */
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel Waiting for CMcondition %d\n",
condition);
}
assert(CManager_locked(cm));
cm->locked--;
thr_condition_wait(cond->cond_condition, cm->exchange_lock);
cm->locked++;
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel After wait for CMcondition %d\n",
condition);
}
}
result = cond->signaled;
CMCondition_destroy(cl, condition);
if (cm_control_debug_flag) {
fprintf(cm->CMTrace_file, "CMLowLevel Return from wait CMcondition %d\n", condition);
}
return result;
}
extern void
INT_CMCondition_signal(CManager cm, int condition)
{
CMCondition cond;
CMControlList cl = cm->control_list;
if(!CManager_locked(cm)) {
printf("Not LOCKED!\n");
}
set_debug_flag(cm);
cond = CMCondition_find(cl, condition);
if (!cond) return;
cond->signaled = 1;
CMCondition_trigger(cm, cond, cl);
if (cl->has_thread == 0) cm->abort_read_ahead = 1;
if (cl->cond_polling) {
/* wake the server thread in case we're not him */
CMwake_server_thread(cm);
}
}
extern void
INT_CMCondition_set_client_data(CManager cm, int condition, void *client_data)
{
CMCondition cond;
CMControlList cl = cm->control_list;
set_debug_flag(cm);
cond = CMCondition_find(cl, condition);
if (!cond) return;
cond->client_data = client_data;
}
extern void *
INT_CMCondition_get_client_data(CManager cm, int condition)
{
CMCondition cond;
void *client_data;
CMControlList cl = cm->control_list;
set_debug_flag(cm);
cond = CMCondition_find(cl, condition);
if (cond) {
client_data = cond->client_data;
return client_data;
} else {
return NULL;
}
}