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//===- llvm/unittest/Support/ThreadSafeAllocatorTest.cpp ------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/ThreadSafeAllocator.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/Support/ThreadPool.h"
#include "gtest/gtest.h"
#include <atomic>
#include <thread>
using namespace llvm;
namespace {
struct AllocCondition {
std::mutex BusyLock, EndLock;
std::condition_variable Busy, End;
bool IsBusy = false, IsEnd = false;
std::atomic<unsigned> BytesAllocated = 0;
void startAllocation() {
{
std::lock_guard<std::mutex> Lock(BusyLock);
IsBusy = true;
}
Busy.notify_all();
}
void waitAllocationStarted() {
std::unique_lock<std::mutex> LBusy(BusyLock);
Busy.wait(LBusy, [&]() { return IsBusy; });
IsBusy = false;
}
void finishAllocation() {
{
std::lock_guard<std::mutex> Lock(EndLock);
IsEnd = true;
}
End.notify_all();
}
void waitAllocationFinished() {
std::unique_lock<std::mutex> LEnd(EndLock);
// Wait for end state.
End.wait(LEnd, [&]() { return IsEnd; });
IsEnd = false;
}
};
class MockAllocator : public AllocatorBase<MockAllocator> {
public:
MockAllocator() = default;
void *Allocate(size_t Size, size_t Alignment) {
C.startAllocation();
C.waitAllocationFinished();
C.BytesAllocated += Size;
return Reserved;
}
AllocCondition &getAllocCondition() { return C; }
private:
char Reserved[16];
AllocCondition C;
};
} // namespace
#if (LLVM_ENABLE_THREADS)
TEST(ThreadSafeAllocatorTest, AllocWait) {
ThreadSafeAllocator<MockAllocator> Alloc;
AllocCondition *C;
// Get the allocation from the allocator first since this requires a lock.
Alloc.applyLocked(
[&](MockAllocator &Alloc) { C = &Alloc.getAllocCondition(); });
DefaultThreadPool Threads;
// First allocation of 1 byte.
Threads.async([&Alloc]() {
char *P = (char *)Alloc.Allocate(1, alignof(char));
P[0] = 0;
});
// No allocation yet.
EXPECT_EQ(C->BytesAllocated, 0u);
C->waitAllocationStarted(); // wait till 1st alloocation starts.
// Second allocation of 2 bytes.
Threads.async([&Alloc]() {
char *P = (char *)Alloc.Allocate(2, alignof(char));
P[1] = 0;
});
C->finishAllocation(); // finish 1st allocation.
C->waitAllocationStarted(); // wait till 2nd allocation starts.
// still 1 byte allocated since 2nd allocation is not finished yet.
EXPECT_EQ(C->BytesAllocated, 1u);
C->finishAllocation(); // finish 2nd allocation.
Threads.wait(); // all allocations done.
EXPECT_EQ(C->BytesAllocated, 3u);
}
TEST(ThreadSafeAllocatorTest, AllocWithAlign) {
ThreadSafeAllocator<BumpPtrAllocator> Alloc;
DefaultThreadPool Threads;
for (unsigned Index = 1; Index < 100; ++Index)
Threads.async(
[&Alloc](unsigned I) {
int *P = (int *)Alloc.Allocate(sizeof(int) * I, alignof(int));
P[I - 1] = I;
},
Index);
Threads.wait();
Alloc.applyLocked([](BumpPtrAllocator &Alloc) {
EXPECT_EQ(4950U * sizeof(int), Alloc.getBytesAllocated());
});
}
TEST(ThreadSafeAllocatorTest, SpecificBumpPtrAllocator) {
ThreadSafeAllocator<SpecificBumpPtrAllocator<int>> Alloc;
DefaultThreadPool Threads;
for (unsigned Index = 1; Index < 100; ++Index)
Threads.async(
[&Alloc](unsigned I) {
int *P = Alloc.Allocate(I);
P[I - 1] = I;
},
Index);
Threads.wait();
}
#endif
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