1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
2 //
3 // Tests of the TokenLock class from lock.h
4
5 #include <pthread.h>
6 #include <stdlib.h>
7 #include <unistd.h> // for usleep()
8
9 #include "v8.h"
10
11 #include "platform.h"
12 #include "cctest.h"
13
14 using namespace ::v8::internal;
15
16
yield()17 static void yield() {
18 UNIMPLEMENTED();
19 }
20
21 static const int kLockCounterLimit = 50;
22 static int busy_lock_counter = 0;
23
24
LoopIncrement(Mutex * mutex,int rem)25 static void LoopIncrement(Mutex* mutex, int rem) {
26 while (true) {
27 int count = 0;
28 int last_count = -1;
29 do {
30 CHECK_EQ(0, mutex->Lock());
31 count = busy_lock_counter;
32 CHECK_EQ(0, mutex->Unlock());
33 yield();
34 } while (count % 2 == rem && count < kLockCounterLimit);
35 if (count >= kLockCounterLimit) break;
36 CHECK_EQ(0, mutex->Lock());
37 CHECK_EQ(count, busy_lock_counter);
38 CHECK(last_count == -1 || count == last_count + 1);
39 busy_lock_counter++;
40 last_count = count;
41 CHECK_EQ(0, mutex->Unlock());
42 yield();
43 }
44 }
45
46
RunTestBusyLock(void * arg)47 static void* RunTestBusyLock(void* arg) {
48 LoopIncrement(static_cast<Mutex*>(arg), 0);
49 return 0;
50 }
51
52
53 // Runs two threads that repeatedly acquire the lock and conditionally
54 // increment a variable.
TEST(BusyLock)55 TEST(BusyLock) {
56 pthread_t other;
57 Mutex* mutex = OS::CreateMutex();
58 int thread_created = pthread_create(&other,
59 NULL,
60 &RunTestBusyLock,
61 mutex);
62 CHECK_EQ(0, thread_created);
63 LoopIncrement(mutex, 1);
64 pthread_join(other, NULL);
65 delete mutex;
66 }
67
68
TEST(VirtualMemory)69 TEST(VirtualMemory) {
70 VirtualMemory* vm = new VirtualMemory(1 * MB);
71 CHECK(vm->IsReserved());
72 void* block_addr = vm->address();
73 size_t block_size = 4 * KB;
74 CHECK(vm->Commit(block_addr, block_size, false));
75 // Check whether we can write to memory.
76 int* addr = static_cast<int*>(block_addr);
77 addr[KB-1] = 2;
78 CHECK(vm->Uncommit(block_addr, block_size));
79 delete vm;
80 }
81