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/* Test creation and removal of failure points while checking them on a
* different thread.
*
* Please note this is a non-deterministic test. */
#include <assert.h>
#include <pthread.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fiu-control.h>
#include <fiu.h>
#define NPOINTS 10000
/* How many seconds to run the test */
#define TEST_TIME 5
/* Signal for the threads to stop. */
bool stop_threads = false;
/* The name of each point */
char point_name[NPOINTS][16];
char *make_point_name(char *name, int i)
{
sprintf(name, "fp-%d", i);
return name;
}
/* Calls all the points all the time. */
unsigned long long no_check_caller_count = 0;
void *no_check_caller(void *unused)
{
int i = 0;
while (!stop_threads) {
fiu_fail(point_name[i]);
i = (i + 1) % NPOINTS;
if (i == 0)
no_check_caller_count++;
}
no_check_caller_count = no_check_caller_count * NPOINTS + i;
return NULL;
}
bool rand_bool(void)
{
return (rand() % 2) == 0;
}
/* Used too know if a point is enabled or not. */
bool enabled[NPOINTS];
pthread_rwlock_t enabled_lock;
/* Calls all the *enabled* points all the time. */
unsigned long long checking_caller_count = 0;
void *checking_caller(void *unused)
{
int i = 0;
int failed;
while (!stop_threads) {
pthread_rwlock_rdlock(&enabled_lock);
if (enabled[i]) {
failed = fiu_fail(point_name[i]) != 0;
pthread_rwlock_unlock(&enabled_lock);
if (!failed) {
printf("ERROR: fp %d did not fail\n", i);
assert(false);
}
} else {
pthread_rwlock_unlock(&enabled_lock);
}
i = (i + 1) % NPOINTS;
if (i == 0)
checking_caller_count++;
}
checking_caller_count = checking_caller_count * NPOINTS + i;
return NULL;
}
/* Enable and disable points all the time. */
unsigned long long enabler_count = 0;
void *enabler(void *unused)
{
int i = 0;
while (!stop_threads) {
if (rand_bool()) {
pthread_rwlock_wrlock(&enabled_lock);
if (enabled[i]) {
assert(fiu_disable(point_name[i]) == 0);
enabled[i] = false;
} else {
assert(fiu_enable(point_name[i], 1, NULL, 0) ==
0);
enabled[i] = true;
}
pthread_rwlock_unlock(&enabled_lock);
}
i = (i + 1) % NPOINTS;
if (i == 0)
enabler_count++;
}
enabler_count = enabler_count * NPOINTS + i;
return NULL;
}
void disable_all()
{
int i = 0;
pthread_rwlock_wrlock(&enabled_lock);
for (i = 0; i < NPOINTS; i++) {
/* Note this could fail as we don't check if they're active or
* not, but here we don't care. */
fiu_disable(point_name[i]);
}
pthread_rwlock_unlock(&enabled_lock);
}
int main(void)
{
int i;
pthread_t t1, t2, t3;
fiu_init(0);
for (i = 0; i < NPOINTS; i++)
make_point_name(point_name[i], i);
pthread_rwlock_init(&enabled_lock, NULL);
pthread_create(&t1, NULL, no_check_caller, NULL);
pthread_create(&t2, NULL, checking_caller, NULL);
pthread_create(&t3, NULL, enabler, NULL);
sleep(TEST_TIME);
stop_threads = 1;
pthread_join(t1, NULL);
pthread_join(t2, NULL);
pthread_join(t3, NULL);
disable_all();
pthread_rwlock_destroy(&enabled_lock);
printf("parallel nc: %-8llu c: %-8llu e: %-8llu t: %llu\n",
no_check_caller_count, checking_caller_count, enabler_count,
no_check_caller_count + checking_caller_count + enabler_count);
return 0;
}
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