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runtime: lock finalizer table accesses

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R=r
CC=golang-dev
https://golang.org/cl/462043
This commit is contained in:
Russ Cox 2010-03-15 20:29:17 -07:00
parent ee9bc00d33
commit acfd7b8d12
1 changed files with 18 additions and 4 deletions
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22
src/pkg/runtime/mfinal.c
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@ -5,6 +5,8 @@
#include "runtime.h"
#include "malloc.h"
Lock finlock;
// Finalizer hash table. Direct hash, linear scan, at most 3/4 full.
// Table size is power of 3 so that hash can be key % max.
// Key[i] == (void*)-1 denotes free but formerly occupied entry
@ -97,18 +99,24 @@ addfinalizer(void *p, void (*f)(void*), int32 nret)
uint32 *ref;
byte *base;
if(!mlookup(p, &base, nil, nil, &ref) || p != base)
lock(&finlock);
if(!mlookup(p, &base, nil, nil, &ref) || p != base) {
unlock(&finlock);
throw("addfinalizer on invalid pointer");
}
if(f == nil) {
if(*ref & RefHasFinalizer) {
getfinalizer(p, 1, nil);
lookfintab(&fintab, p, 1, nil);
*ref &= ~RefHasFinalizer;
}
unlock(&finlock);
return;
}
if(*ref & RefHasFinalizer)
if(*ref & RefHasFinalizer) {
unlock(&finlock);
throw("double finalizer");
}
*ref |= RefHasFinalizer;
if(fintab.nkey >= fintab.max/2+fintab.max/4) {
@ -141,6 +149,7 @@ addfinalizer(void *p, void (*f)(void*), int32 nret)
}
addfintab(&fintab, p, f, nret);
unlock(&finlock);
}
// get finalizer; if del, delete finalizer.
@ -148,5 +157,10 @@ addfinalizer(void *p, void (*f)(void*), int32 nret)
void*
getfinalizer(void *p, bool del, int32 *nret)
{
return lookfintab(&fintab, p, del, nret);
void *f;
lock(&finlock);
f = lookfintab(&fintab, p, del, nret);
unlock(&finlock);
return f;
}