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[Support] Add sys::Process::GetRandomNumber().
- Primitive API, but we rarely have need for random numbers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156237 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1,4 +1,4 @@
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//===- llvm/Support/Process.h ------------------------------------*- C++ -*-===//
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//===- llvm/Support/Process.h -----------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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@ -142,6 +142,10 @@ namespace sys {
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/// Resets the terminals colors, or returns an escape sequence to do so.
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static const char *ResetColor();
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/// Get the result of a process wide random number generator. The
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/// generator will be automatically seeded in non-deterministic fashion.
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static unsigned GetRandomNumber();
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/// @}
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};
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}
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@ -22,6 +22,15 @@ using namespace sys;
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//=== independent code.
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//===----------------------------------------------------------------------===//
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unsigned llvm::sys::Process::GetRandomNumber() {
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#if defined(HAVE_ARC4RANDOM)
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return arc4random();
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#else
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static int x = (::srand(::time(NULL)), 0);
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return rand();
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#endif
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}
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}
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// Include the platform-specific parts of this class.
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