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// Copyright 2006-2008 the V8 project authors. All rights reserved.
//
// Tests of the TokenLock class from lock.h
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h> // for usleep()
#include "v8.h"
#include "platform.h"
#include "cctest.h"
using namespace ::v8::internal;
static void yield() {
usleep(1);
}
static const int kLockCounterLimit = 50;
static int busy_lock_counter = 0;
static void LoopIncrement(Mutex* mutex, int rem) {
while (true) {
int count = 0;
int last_count = -1;
do {
CHECK_EQ(0, mutex->Lock());
count = busy_lock_counter;
CHECK_EQ(0, mutex->Unlock());
yield();
} while (count % 2 == rem && count < kLockCounterLimit);
if (count >= kLockCounterLimit) break;
CHECK_EQ(0, mutex->Lock());
CHECK_EQ(count, busy_lock_counter);
CHECK(last_count == -1 || count == last_count + 1);
busy_lock_counter++;
last_count = count;
CHECK_EQ(0, mutex->Unlock());
yield();
}
}
static void* RunTestBusyLock(void* arg) {
LoopIncrement(static_cast<Mutex*>(arg), 0);
return 0;
}
// Runs two threads that repeatedly acquire the lock and conditionally
// increment a variable.
TEST(BusyLock) {
pthread_t other;
Mutex* mutex = OS::CreateMutex();
int thread_created = pthread_create(&other,
NULL,
&RunTestBusyLock,
mutex);
CHECK_EQ(0, thread_created);
LoopIncrement(mutex, 1);
pthread_join(other, NULL);
delete mutex;
}
TEST(VirtualMemory) {
OS::SetUp();
VirtualMemory* vm = new VirtualMemory(1 * MB);
CHECK(vm->IsReserved());
void* block_addr = vm->address();
size_t block_size = 4 * KB;
CHECK(vm->Commit(block_addr, block_size, false));
// Check whether we can write to memory.
int* addr = static_cast<int*>(block_addr);
addr[KB-1] = 2;
CHECK(vm->Uncommit(block_addr, block_size));
delete vm;
}
TEST(GetCurrentProcessId) {
OS::SetUp();
CHECK_EQ(static_cast<int>(getpid()), OS::GetCurrentProcessId());
}
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