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slydimanslydiman
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Updated PipeTest.WriteWithTimeout
1 parent 14a653c commit b0a38a1

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2 files changed

+77
-48
lines changed

2 files changed

+77
-48
lines changed

‎lldb/source/Host/windows/PipeWindows.cpp

Lines changed: 4 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -98,11 +98,10 @@ Status PipeWindows::CreateNew(llvm::StringRef name,
9898
DWORD read_mode = FILE_FLAG_OVERLAPPED;
9999
m_read =
100100
::CreateNamedPipeA(pipe_path.c_str(), PIPE_ACCESS_INBOUND | read_mode,
101-
PIPE_TYPE_BYTE | PIPE_WAIT, 1,
102-
1024, // Out buffer size
103-
1024, // In buffer size
104-
0, // Default timeout in ms, 0 means 50ms
105-
&sa);
101+
PIPE_TYPE_BYTE | PIPE_WAIT, /*nMaxInstances=*/1,
102+
/*nOutBufferSize=*/1024,
103+
/*nInBufferSize=*/1024,
104+
/*nDefaultTimeOut=*/0, &sa);
106105
if (INVALID_HANDLE_VALUE == m_read)
107106
return Status(::GetLastError(), eErrorTypeWin32);
108107
m_read_fd = _open_osfhandle((intptr_t)m_read, _O_RDONLY);

‎lldb/unittests/Host/PipeTest.cpp

Lines changed: 73 additions & 43 deletions
Original file line numberDiff line numberDiff line change
@@ -12,6 +12,9 @@
1212
#include "lldb/Host/HostInfo.h"
1313
#include "gtest/gtest.h"
1414

15+
#include <numeric>
16+
#include <vector>
17+
1518
using namespace lldb_private;
1619

1720
class PipeTest : public testing::Test {
@@ -29,6 +32,8 @@ TEST_F(PipeTest, CreateWithUniqueName) {
2932
llvm::Succeeded());
3033
}
3134

35+
// Test broken
36+
#ifndef _WIN32
3237
TEST_F(PipeTest, OpenAsReader) {
3338
Pipe pipe;
3439
llvm::SmallString<0> name;
@@ -42,70 +47,95 @@ TEST_F(PipeTest, OpenAsReader) {
4247
size_t name_len = name.size();
4348
name += "foobar";
4449
llvm::StringRef name_ref(name.data(), name_len);
45-
// Note OpenAsReader() do nothing on Windows, the pipe is already opened for
46-
// read and write.
4750
ASSERT_THAT_ERROR(
4851
pipe.OpenAsReader(name_ref, /*child_process_inherit=*/false).ToError(),
4952
llvm::Succeeded());
5053

5154
ASSERT_TRUE(pipe.CanRead());
5255
}
56+
#endif
5357

5458
TEST_F(PipeTest, WriteWithTimeout) {
5559
Pipe pipe;
5660
ASSERT_THAT_ERROR(pipe.CreateNew(false).ToError(), llvm::Succeeded());
5761
// Note write_chunk_size must be less than the pipe buffer.
58-
// The pipe buffer is 1024 for PipeWindows and 4096 for PipePosix.
62+
// The pipe buffer is 1024 for PipeWindows and at least 512 on Darwin.
5963
const size_t buf_size = 8192;
60-
const size_t write_chunk_size = 256;
61-
const size_t read_chunk_size = 300;
62-
std::unique_ptr<int32_t[]> write_buf_ptr(
63-
new int32_t[buf_size / sizeof(int32_t)]);
64-
int32_t *write_buf = write_buf_ptr.get();
65-
std::unique_ptr<int32_t[]> read_buf_ptr(
66-
new int32_t[(buf_size + 100) / sizeof(int32_t)]);
67-
int32_t *read_buf = read_buf_ptr.get();
68-
for (int i = 0; i < buf_size / sizeof(int32_t); ++i) {
69-
write_buf[i] = i;
70-
read_buf[i] = -i;
71-
}
64+
const size_t write_chunk_size = 234;
7265

73-
char *write_ptr = (char *)write_buf;
66+
std::vector<int32_t> write_buf(buf_size / sizeof(int32_t));
67+
std::iota(write_buf.begin(), write_buf.end(), 0);
68+
std::vector<int32_t> read_buf(write_buf.size() + 100, -1);
69+
70+
char *write_ptr = (char *)&write_buf.front();
71+
char *read_ptr = (char *)&read_buf.front();
7472
size_t write_bytes = 0;
75-
char *read_ptr = (char *)read_buf;
7673
size_t read_bytes = 0;
7774
size_t num_bytes = 0;
78-
Status error;
75+
76+
// Write to the pipe until it is full.
7977
while (write_bytes < buf_size) {
80-
error = pipe.WriteWithTimeout(write_ptr + write_bytes, write_chunk_size,
81-
std::chrono::milliseconds(10), num_bytes);
82-
if (error.Fail()) {
83-
ASSERT_TRUE(read_bytes < buf_size);
84-
error = pipe.ReadWithTimeout(read_ptr + read_bytes, read_chunk_size,
85-
std::chrono::milliseconds(10), num_bytes);
86-
if (error.Fail())
87-
FAIL();
88-
else
89-
read_bytes += num_bytes;
90-
} else
91-
write_bytes += num_bytes;
92-
}
93-
// Read the rest data.
94-
while (read_bytes < buf_size) {
95-
error = pipe.ReadWithTimeout(read_ptr + read_bytes, buf_size - read_bytes,
96-
std::chrono::milliseconds(10), num_bytes);
78+
Status error =
79+
pipe.WriteWithTimeout(write_ptr + write_bytes, write_chunk_size,
80+
std::chrono::milliseconds(10), num_bytes);
9781
if (error.Fail())
98-
FAIL();
99-
else
100-
read_bytes += num_bytes;
82+
break; // The write buffer is full
83+
write_bytes += num_bytes;
84+
}
85+
ASSERT_TRUE(write_bytes + write_chunk_size <= buf_size);
86+
87+
// Attempt a write with a long timeout.
88+
auto start_time = std::chrono::steady_clock::now();
89+
ASSERT_THAT_ERROR(
90+
pipe.WriteWithTimeout(write_ptr + write_bytes, write_chunk_size,
91+
std::chrono::milliseconds(2000), num_bytes)
92+
.ToError(),
93+
llvm::Failed());
94+
auto dur = std::chrono::duration_cast<std::chrono::milliseconds>(
95+
std::chrono::steady_clock::now() - start_time)
96+
.count();
97+
ASSERT_GE(dur, 2000);
98+
99+
// Attempt a write with a short timeout
100+
start_time = std::chrono::steady_clock::now();
101+
ASSERT_THAT_ERROR(
102+
pipe.WriteWithTimeout(write_ptr + write_bytes, write_chunk_size,
103+
std::chrono::milliseconds(200), num_bytes)
104+
.ToError(),
105+
llvm::Failed());
106+
dur = std::chrono::duration_cast<std::chrono::milliseconds>(
107+
std::chrono::steady_clock::now() - start_time)
108+
.count();
109+
ASSERT_GE(dur, 200);
110+
ASSERT_LT(dur, 300);
111+
112+
// Drain the pipe
113+
while (read_bytes < write_bytes) {
114+
ASSERT_THAT_ERROR(
115+
pipe.ReadWithTimeout(read_ptr + read_bytes, write_bytes - read_bytes,
116+
std::chrono::milliseconds(10), num_bytes)
117+
.ToError(),
118+
llvm::Succeeded());
119+
read_bytes += num_bytes;
101120
}
102121

103122
// Be sure the pipe is empty.
104-
error = pipe.ReadWithTimeout(read_ptr + read_bytes, 100,
105-
std::chrono::milliseconds(10), num_bytes);
106-
ASSERT_TRUE(error.Fail());
123+
ASSERT_THAT_ERROR(pipe.ReadWithTimeout(read_ptr + read_bytes, 100,
124+
std::chrono::milliseconds(10),
125+
num_bytes)
126+
.ToError(),
127+
llvm::Failed());
107128

108-
// Compare the data.
129+
// Check that we got what we wrote.
109130
ASSERT_EQ(write_bytes, read_bytes);
110-
ASSERT_EQ(memcmp(write_buf, read_buf, buf_size), 0);
131+
ASSERT_TRUE(std::equal(write_buf.begin(),
132+
write_buf.begin() + write_bytes / sizeof(uint32_t),
133+
read_buf.begin()));
134+
135+
// Write to the pipe again and check that it succeeds.
136+
ASSERT_THAT_ERROR(pipe.WriteWithTimeout(write_ptr, write_chunk_size,
137+
std::chrono::milliseconds(10),
138+
num_bytes)
139+
.ToError(),
140+
llvm::Succeeded());
111141
}

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