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Eliminate a global constructor from the runtime #1983

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Merged
merged 1 commit into from
Mar 31, 2016
Merged

Eliminate a global constructor from the runtime #1983

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11 changes: 7 additions & 4 deletions stdlib/public/stubs/LibcShims.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -66,18 +66,21 @@ size_t _swift_stdlib_malloc_size(const void *ptr) {
#error No malloc_size analog known for this platform/libc.
#endif

static std::mt19937 MersenneRandom;
static std::mt19937 &getGlobalMT19937() {
static std::mt19937 MersenneRandom;
return MersenneRandom;
}

__swift_uint32_t _swift_stdlib_cxx11_mt19937(void) {
return MersenneRandom();
__swift_uint32_t _swift_stdlib_cxx11_mt19937() {
return getGlobalMT19937()();
}

__swift_uint32_t
_swift_stdlib_cxx11_mt19937_uniform(__swift_uint32_t upper_bound) {
if (upper_bound > 0)
upper_bound--;
std::uniform_int_distribution<__swift_uint32_t> RandomUniform(0, upper_bound);
return RandomUniform(MersenneRandom);
return RandomUniform(getGlobalMT19937());
}

} // namespace swift
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