tcannot trust system libraries to lock properly.  sigh. - plan9port - [fork] Plan 9 from user space
 (HTM) git clone git://src.adamsgaard.dk/plan9port
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       ---
 (DIR) commit 8be32ce2cb17950569b94273cee6099289c4d022
 (DIR) parent 750819026920751b81833cb60270ad7047e75cdc
 (HTM) Author: rsc <devnull@localhost>
       Date:   Thu, 14 Jul 2005 00:06:43 +0000
       
       cannot trust system libraries to lock properly.  sigh.
       
       Diffstat:
         M src/lib9/malloc.c                   |      23 ++++++++++++++++++++---
       
       1 file changed, 20 insertions(+), 3 deletions(-)
       ---
 (DIR) diff --git a/src/lib9/malloc.c b/src/lib9/malloc.c
       t@@ -7,12 +7,19 @@
        #define NOPLAN9DEFINES
        #include <libc.h>
        
       +static Lock malloclock;
       +
        void*
        p9malloc(ulong n)
        {
       +        void *v;
       +        
                if(n == 0)
                        n++;
       -        return malloc(n);
       +        lock(&malloclock);
       +        v = malloc(n);
       +        unlock(&malloclock);
       +        return v;
        }
        
        void
       t@@ -20,20 +27,30 @@ p9free(void *v)
        {
                if(v == nil)
                        return;
       +        lock(&malloclock);
                free(v);
       +        unlock(&malloclock);
        }
        
        void*
        p9calloc(ulong a, ulong b)
        {
       +        void *v;
       +        
                if(a*b == 0)
                        a = b = 1;
        
       -        return calloc(a*b, 1);
       +        lock(&malloclock);
       +        v = calloc(a*b, 1);
       +        unlock(&malloclock);
       +        return v;
        }
        
        void*
        p9realloc(void *v, ulong n)
        {
       -        return realloc(v, n);
       +        lock(&malloclock);
       +        v = realloc(v, n);
       +        unlock(&malloclock);
       +        return v;
        }