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bus error?!

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This commit is contained in:
leitner 2004-01-10 00:06:56 +00:00
parent e92d4ca5f5
commit 6d35239e2c
1 changed files with 4 additions and 3 deletions
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7
io/iob_prefetch.c
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@ -3,6 +3,7 @@
#include <sys/mman.h>
void iob_prefetch(io_batch* b,uint64 bytes) {
volatile char x;
iob_entry* e,* last;
if (b->bytesleft==0) return;
last=(iob_entry*)(((char*)array_start(&b->b))+array_bytes(&b->b));
@ -13,13 +14,12 @@ void iob_prefetch(io_batch* b,uint64 bytes) {
char* c,* d;
uint64 before=bytes;
if (e->n>=1000000) {
d=c=mmap(0,bytes,PROT_READ,MAP_SHARED,e->fd,(e->offset|4095)+1);
d=c=mmap(0,bytes+4095,PROT_READ,MAP_SHARED,e->fd,(e->offset|4095)+1);
if (c!=MAP_FAILED) {
while (bytes>4096) {
volatile char x=*d;
x=*d;
bytes-=4096;
d+=4096;
(void)x;
}
}
munmap(c,before);
@ -27,4 +27,5 @@ void iob_prefetch(io_batch* b,uint64 bytes) {
return;
}
}
(void)x;
}