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#include <assert.h>
#include <dlfcn.h>
#include <pthread.h>
#include <stdio.h>
#ifndef NUM_THREADS
#define NUM_THREADS 2
#endif
typedef int* (*sidey_data_type)();
typedef int (*func_t)();
typedef func_t (*sidey_func_type)();
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
_Atomic int thread_count = 0;
_Atomic int dso_count = 0;
void jslib_func();
void* thread_main(void* arg) {
int num = (intptr_t)arg;
printf("thread_main %d %p\n", num, pthread_self());
thread_count++;
void* func_addr = dlsym(RTLD_DEFAULT, "jslib_func");
assert(func_addr);
printf("jslib_func via dlsym: %p\n", func_addr);
// busy wait until all threads are running
while (thread_count != NUM_THREADS) {}
char filename[255];
sprintf(filename, "liblib%d.so", num);
printf("loading %s\n", filename);
void* handle = dlopen(filename, RTLD_NOW|RTLD_GLOBAL);
printf("done loading %s (total=%d)\n", filename, ++dso_count);
if (!handle) {
printf("dlerror: %s\n", dlerror());
}
assert(handle);
sidey_data_type p_side_data_address;
sidey_func_type p_side_func_address;
p_side_data_address = dlsym(handle, "side_data_address");
printf("p_side_data_address=%p\n", p_side_data_address);
p_side_func_address = dlsym(handle, "side_func_address");
printf("p_side_func_address=%p\n", p_side_func_address);
printf("done thread_main %d\n", num);
return NULL;
}
int main() {
printf("in main: %p\n", pthread_self());
jslib_func();
pthread_mutex_lock(&mutex);
// start a bunch of threads while holding the lock
pthread_t threads[NUM_THREADS];
for (int i = 0; i < NUM_THREADS; i++) {
pthread_create(&threads[i], NULL, thread_main, (void*)(intptr_t)i);
}
// busy wait until all threads are running
while (thread_count != NUM_THREADS) {}
for (int i = 0; i < NUM_THREADS; i++) {
pthread_join(threads[i], NULL);
}
printf("main done\n");
return 0;
}
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