diff options
Diffstat (limited to 'test/monniaux/multithreaded_volatile/volatile.c')
-rw-r--r-- | test/monniaux/multithreaded_volatile/volatile.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/test/monniaux/multithreaded_volatile/volatile.c b/test/monniaux/multithreaded_volatile/volatile.c new file mode 100644 index 00000000..d4e08d6d --- /dev/null +++ b/test/monniaux/multithreaded_volatile/volatile.c @@ -0,0 +1,33 @@ +#include <stdio.h> +#include <time.h> + +int pthread_create(pthread_t *thread, const pthread_attr_t *attr, + void *(*start_routine) (void *), void *arg); +int pthread_join(pthread_t thread, void **retval); + +typedef unsigned data; + +static inline data powM(data x, unsigned e) { + data y = 1; + for(unsigned i=0; i<e; i++) { + y = (y * x) % 65537; + } + return y; +} + +void* second_thread_entry(void *ptr) { + *((volatile data*) ptr) = powM(3, 65536); + return NULL; +} + +int main() { + pthread_t second_thread_id; + volatile data value; + pthread_create(&second_thread_id, NULL, + second_thread_entry, (void*) &value); + value = 69; + data correct = powM(3, 65536*2); + data read = value; + pthread_join(second_thread_id, NULL); + printf("%u %u %s\n", read, correct, read == correct ? "OK" : "FAIL"); +} |