From 144a5d3c86acdebeb3af53c03325a85d44b06679 Mon Sep 17 00:00:00 2001 From: Glenn Kasten Date: Sun, 9 Jan 2011 09:50:10 -0800 Subject: Bug 3330205 Thread safety for bignum powers of 5 Change-Id: I739a06f9037a9fb643276f61601f0f3e192581b8 --- libc/stdlib/strtod.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'libc') diff --git a/libc/stdlib/strtod.c b/libc/stdlib/strtod.c index 2851506..ab637a1 100644 --- a/libc/stdlib/strtod.c +++ b/libc/stdlib/strtod.c @@ -754,6 +754,7 @@ mult } static Bigint *p5s; + static pthread_mutex_t p5s_mutex = PTHREAD_MUTEX_INITIALIZER; static Bigint * pow5mult @@ -775,11 +776,13 @@ pow5mult if (!(k = (unsigned int) k >> 2)) return b; + mutex_lock(&p5s_mutex); if (!(p5 = p5s)) { /* first time */ p5 = i2b(625); if (p5 == BIGINT_INVALID) { Bfree(b); + mutex_unlock(&p5s_mutex); return p5; } p5s = p5; @@ -797,6 +800,7 @@ pow5mult p51 = mult(p5,p5); if (p51 == BIGINT_INVALID) { Bfree(b); + mutex_unlock(&p5s_mutex); return p51; } p5->next = p51; @@ -804,6 +808,7 @@ pow5mult } p5 = p51; } + mutex_unlock(&p5s_mutex); return b; } -- cgit v1.1