ciabatta/tests/threaded.c

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#include <stdio.h>
#include <stdlib.h>
#include <threads.h>
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#include <stdatomic.h>
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#include <cia/sync.h>
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static void print_string_n(char *str, u64 len) {
fwrite(str, 1, len, stdout);
}
static void print_char(char c) {
print_string_n(&c, 1);
}
static void print_string(char *str) {
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int str_len = 0;
while(str[str_len] != 0) {
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str_len += 1;
}
print_string_n(str, str_len);
}
static void print_int(i64 number) {
if(number < 0) {
print_char('-');
number = -number;
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}
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char buf[20];
buf[19] = 0;
char *p = buf + sizeof buf - 1;
do {
*--p = (number%10) + '0';
number /= 10;
} while(number > 0);
print_string(p);
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}
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static Cia_Mutex g_print_mutex;
static Cia_Mutex g_mutex;
static volatile i64 counter = 0;
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int thrd_func(void *arg) {
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print_string("child thread: ok!\n");
for(int i = 0; i < 100000; ++i) {
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cia_mutex_lock(&g_mutex);
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counter += 1;
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cia_mutex_unlock(&g_mutex);
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}
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cia_mutex_lock(&g_print_mutex);
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print_string("child thread: counter = ");
print_int(counter);
print_char('\n');
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cia_mutex_unlock(&g_print_mutex);
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return 0;
}
int main() {
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print_string("main thread: before\n");
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cia_mutex_init(&g_mutex);
cia_mutex_init(&g_print_mutex);
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thrd_t thrd;
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int status = thrd_create(&thrd, thrd_func, NULL);
if(status == thrd_error) {
print_string("main thread: error creating child thread\n");
return 1;
}
print_string("main thread: after!\n");
for(int i = 0; i < 100000; ++i) {
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cia_mutex_lock(&g_mutex);
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counter += 1;
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cia_mutex_unlock(&g_mutex);
}
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int exit_code;
thrd_join(thrd, &exit_code);
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cia_mutex_lock(&g_print_mutex);
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print_string("main thread: counter = ");
print_int(counter);
print_char('\n');
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cia_mutex_unlock(&g_print_mutex);
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return 0;
}