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Simplified l4_mutex test, in that the test now updates a variable by thread

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switching instead of updating a whole page.
This commit is contained in:
Bahadir Balban
2009-06-01 15:51:54 +03:00
parent 78a5ec9d6d
commit 5a616d1eb5
1 changed files with 51 additions and 60 deletions
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111
tasks/test0/src/mutextest.c
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@@ -20,9 +20,7 @@
*/
struct shared_page {
struct l4_mutex mutex;
int child_has_run;
int parent_has_run;
char page_rest[];
int shared_var;
};
static struct shared_page *shared_page;
@@ -38,7 +36,6 @@ int user_mutex_test(void)
{
pid_t child, parent;
int map_size = PAGE_SIZE;
int buf_size;
void *base;
/* Get parent pid */
@@ -59,19 +56,11 @@ int user_mutex_test(void)
shared_page = base;
/* Find the buffer size */
buf_size = map_size - sizeof(*shared_page);
printf("Total buffer size: %d\n", buf_size);
/* Initialize the mutex */
l4_mutex_init(&shared_page->mutex);
/* Initialize buffer with unique child value */
printf("Initializing shared page with child values.\n");
shared_page->child_has_run = 0;
shared_page->parent_has_run = 0;
for (int i = 0; i < buf_size; i++)
shared_page->page_rest[i] = 0;
/* Initialize the shared variable */
shared_page->shared_var = 0;
/* Fork the current task */
if ((child = fork()) < 0) {
@@ -87,80 +76,82 @@ int user_mutex_test(void)
/* Child locks and produces */
if (child == 0) {
for (int x = 0; x < 255; x++) {
/* Lock */
for (int x = 0; x < 10000; x++) {
int temp;
/* Lock page */
printf("Child locking page.\n");
l4_mutex_lock(&shared_page->mutex);
/* Read variable */
printf("Child locked page.\n");
temp = shared_page->shared_var;
/* Thread switch */
l4_thread_switch(0);
/* Get sample value */
//char val = shared_page->page_rest[0];
/* Write a unique child value to whole buffer */
for (int i = 0; i < buf_size; i++) {
#if 0
/* Check sample is same in all */
if (shared_page->page_rest[i] != val) {
printf("Sample values dont match. "
"page_rest[%d] = %c, "
"val = %c\n", i,
shared_page->page_rest[i], val);
goto out_err;
}
#endif
shared_page->page_rest[i]--;
}
printf("Child produced. Unlocking...\n");
/* Update local copy */
temp++;
/* Thread switch */
l4_thread_switch(0);
/* Write back the result */
shared_page->shared_var = temp;
printf("Child modified. Unlocking...\n");
/* Unlock */
l4_mutex_unlock(&shared_page->mutex);
printf("Child unlocked page.\n");
/* Thread switch */
l4_thread_switch(0);
}
/* Sync with the parent */
l4_send(parent, L4_IPC_TAG_SYNC);
/* Parent locks and consumes */
} else {
for (int x = 0; x < 255; x++) {
printf("Parent locking page.\n");
for (int x = 0; x < 10000; x++) {
int temp;
/* Lock the page */
/* Lock page */
printf("Parent locking page.\n");
l4_mutex_lock(&shared_page->mutex);
/* Read variable */
printf("Parent locked page.\n");
temp = shared_page->shared_var;
/* Thread switch */
l4_thread_switch(0);
// printf("Parent reading:\n");
/* Update local copy */
temp--;
/* Test and consume the page */
for (int i = 0; i < buf_size; i++) {
// printf("%c", shared_page->page_rest[i]);
/* Test that child has produced */
#if 0
if (shared_page->page_rest[i] != 'c') {
printf("Child not produced. "
"page_rest[%d] = %c, "
"expected = 'c'\n",
i, shared_page->page_rest[i]);
BUG();
goto out_err;
}
#endif
/* Consume the page */
shared_page->page_rest[i]++;
}
// printf("\n\n");
printf("Parent consumed. Unlocking...\n");
/* Thread switch */
l4_thread_switch(0);
/* Write back the result */
shared_page->shared_var = temp;
printf("Parent modified. Unlocking...\n");
/* Unlock */
l4_mutex_unlock(&shared_page->mutex);
printf("Parent unlocked page.\n");
/* Thread switch */
l4_thread_switch(0);
}
/* Sync with the child */
l4_receive(child);
printf("Parent checking validity of values.\n");
for (int i = 0; i < 255; i++)
if (shared_page->page_rest[i] != 0)
goto out_err;
printf("Parent checking validity of value.\n");
if (shared_page->shared_var != 0)
goto out_err;
printf("USER MUTEX TEST: -- PASSED --\n");
}