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[Support] Add sys::Process::GetRandomNumber().

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- Primitive API, but we rarely have need for random numbers.

llvm-svn: 156237
This commit is contained in:
Daniel Dunbar 2012-05-05 16:36:20 +00:00
parent c69f7c9234
commit 457eab2ad7
2 changed files with 14 additions and 1 deletions
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6
include/llvm/Support/Process.h
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@ -1,4 +1,4 @@
//===- llvm/Support/Process.h ------------------------------------*- C++ -*-===//
//===- llvm/Support/Process.h -----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
@ -142,6 +142,10 @@ namespace sys {
/// Resets the terminals colors, or returns an escape sequence to do so.
static const char *ResetColor();
/// Get the result of a process wide random number generator. The
/// generator will be automatically seeded in non-deterministic fashion.
static unsigned GetRandomNumber();
/// @}
};
}

9
lib/Support/Process.cpp
View File

@ -22,6 +22,15 @@ using namespace sys;
//=== independent code.
//===----------------------------------------------------------------------===//
unsigned llvm::sys::Process::GetRandomNumber() {
#if defined(HAVE_ARC4RANDOM)
return arc4random();
#else
static int x = (::srand(::time(NULL)), 0);
return rand();
#endif
}
}
// Include the platform-specific parts of this class.