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Implemented support for Process::GetRandomNumber on Windows.

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Patch thanks to Stephan Tolksdorf!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200767 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Aaron Ballman 2014-02-04 14:49:21 +00:00
parent 055e70063b
commit 8753ba91d2
3 changed files with 19 additions and 0 deletions
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5
lib/Support/Process.cpp
View File

@ -12,6 +12,11 @@
//===----------------------------------------------------------------------===//
#include "llvm/Config/config.h"
#if LLVM_ON_WIN32
// This define makes stdlib.h declare the rand_s function.
#define _CRT_RAND_S
#include <stdlib.h>
#endif
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Process.h"

7
lib/Support/Windows/Process.inc
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@ -360,3 +360,10 @@ const char *Process::ResetColor() {
SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), defaultColors());
return 0;
}
unsigned Process::GetRandomNumber() {
unsigned int result;
const errno_t ec = rand_s(&result);
assert(ec == 0 && "rand_s failed");
return result;
}

7
unittests/Support/ProcessTest.cpp
View File

@ -39,6 +39,13 @@ TEST(ProcessTest, SelfProcess) {
EXPECT_GT(TimeValue::MaxTime, process::get_self()->get_wall_time());
}
TEST(ProcessTest, GetRandomNumberTest) {
const unsigned r1 = Process::GetRandomNumber();
const unsigned r2 = Process::GetRandomNumber();
// It should be extremely unlikely that both r1 and r2 are 0.
EXPECT_NE((r1 | r2), 0);
}
#ifdef _MSC_VER
#define setenv(name, var, ignore) _putenv_s(name, var)
#endif