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runtime: update comment on stack allocator

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R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9665046
This commit is contained in:
Dmitriy Vyukov 2013-05-25 22:47:36 +04:00
parent a2ec8abd2d
commit 46137f227b
1 changed files with 4 additions and 7 deletions
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11
src/pkg/runtime/stack.c
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@ -81,13 +81,10 @@ runtime·stackalloc(uint32 n)
if(g != m->g0)
runtime·throw("stackalloc not on scheduler stack");
// Stack allocator uses malloc/free most of the time,
// but if we're in the middle of malloc and need stack,
// we have to do something else to avoid deadlock.
// In that case, we fall back on a fixed-size free-list
// allocator, assuming that inside malloc all the stack
// frames are small, so that all the stack allocations
// will be a single size, the minimum (right now, 5k).
// Stacks are usually allocated with a fixed-size free-list allocator,
// but if we need a stack of non-standard size, we fall back on malloc
// (assuming that inside malloc and GC all the stack frames are small,
// so that we do not deadlock).
if(n == FixedStack || m->mallocing || m->gcing) {
if(n != FixedStack) {
runtime·printf("stackalloc: in malloc, size=%d want %d\n", FixedStack, n);