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#include <gtest/gtest.h>
#include "AllocationTestHarness.h"
#include <base/logging.h>
#include <sys/select.h>
#include <unistd.h>
#include "osi/include/osi.h"
#include "osi/include/reactor.h"
#include "osi/include/semaphore.h"
#include "osi/include/thread.h"
struct SemaphoreTestSequenceHelper {
semaphore_t* semaphore;
int counter;
};
namespace {
void sleep_then_increment_counter(void* context) {
SemaphoreTestSequenceHelper* helper =
reinterpret_cast<SemaphoreTestSequenceHelper*>(context);
CHECK(helper);
CHECK(helper->semaphore);
sleep(1);
++helper->counter;
semaphore_post(helper->semaphore);
}
} // namespace
class SemaphoreTest : public AllocationTestHarness {};
TEST_F(SemaphoreTest, test_new_simple) {
semaphore_t* semaphore = semaphore_new(0);
ASSERT_TRUE(semaphore != NULL);
semaphore_free(semaphore);
}
TEST_F(SemaphoreTest, test_new_with_value) {
semaphore_t* semaphore = semaphore_new(3);
ASSERT_TRUE(semaphore != NULL);
EXPECT_TRUE(semaphore_try_wait(semaphore));
EXPECT_TRUE(semaphore_try_wait(semaphore));
EXPECT_TRUE(semaphore_try_wait(semaphore));
EXPECT_FALSE(semaphore_try_wait(semaphore));
semaphore_free(semaphore);
}
TEST_F(SemaphoreTest, test_try_wait) {
semaphore_t* semaphore = semaphore_new(0);
ASSERT_TRUE(semaphore != NULL);
EXPECT_FALSE(semaphore_try_wait(semaphore));
semaphore_post(semaphore);
EXPECT_TRUE(semaphore_try_wait(semaphore));
EXPECT_FALSE(semaphore_try_wait(semaphore));
semaphore_free(semaphore);
}
TEST_F(SemaphoreTest, test_wait_after_post) {
semaphore_t* semaphore = semaphore_new(0);
ASSERT_TRUE(semaphore != NULL);
semaphore_post(semaphore);
semaphore_wait(semaphore);
semaphore_free(semaphore);
}
TEST_F(SemaphoreTest, test_ensure_wait) {
semaphore_t* semaphore = semaphore_new(0);
ASSERT_TRUE(semaphore != NULL);
thread_t* thread = thread_new("semaphore_test_thread");
ASSERT_TRUE(thread != NULL);
EXPECT_FALSE(semaphore_try_wait(semaphore));
SemaphoreTestSequenceHelper sequence_helper = {semaphore, 0};
thread_post(thread, sleep_then_increment_counter, &sequence_helper);
semaphore_wait(semaphore);
EXPECT_EQ(sequence_helper.counter, 1)
<< "semaphore_wait() did not wait for counter to increment";
semaphore_free(semaphore);
thread_free(thread);
}
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