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random.c: refactor

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* random.c (fill_random_bytes): separate non-raced and raced
  conditions, on Windows.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51024 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2015-06-25 06:32:23 +00:00
parent 2c3656f5e8
commit f9c2adf310
1 changed files with 6 additions and 7 deletions
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13
random.c
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@ -486,17 +486,16 @@ fill_random_bytes(void *seed, size_t size)
prov = (HCRYPTPROV)INVALID_HANDLE_VALUE;
}
old_prov = (HCRYPTPROV)ATOMIC_PTR_CAS(perm_prov, 0, prov);
if (prov == (HCRYPTPROV)INVALID_HANDLE_VALUE) {
if (old_prov) prov = old_prov;
}
else {
if (!old_prov) {
if (LIKELY(!old_prov)) { /* no other threads acquried */
if (prov != (HCRYPTPROV)INVALID_HANDLE_VALUE) {
rb_gc_register_mark_object(Data_Wrap_Struct(0, 0, release_crypt, &perm_prov));
}
else {
}
else { /* another thread acquried */
if (prov != (HCRYPTPROV)INVALID_HANDLE_VALUE) {
CryptReleaseContext(prov, 0);
prov = old_prov;
}
prov = old_prov;
}
}
if (prov == (HCRYPTPROV)INVALID_HANDLE_VALUE) return -1;