minix/lib/libsys/asynsend.c
Ben Gras 35a108b911 panic() cleanup.
this change
   - makes panic() variadic, doing full printf() formatting -
     no more NO_NUM, and no more separate printf() statements
     needed to print extra info (or something in hex) before panicing
   - unifies panic() - same panic() name and usage for everyone -
     vm, kernel and rest have different names/syntax currently
     in order to implement their own luxuries, but no longer
   - throws out the 1st argument, to make source less noisy.
     the panic() in syslib retrieves the server name from the kernel
     so it should be clear enough who is panicing; e.g.
         panic("sigaction failed: %d", errno);
     looks like:
         at_wini(73130): panic: sigaction failed: 0
         syslib:panic.c: stacktrace: 0x74dc 0x2025 0x100a
   - throws out report() - printf() is more convenient and powerful
   - harmonizes/fixes the use of panic() - there were a few places
     that used printf-style formatting (didn't work) and newlines
     (messes up the formatting) in panic()
   - throws out a few per-server panic() functions
   - cleans up a tie-in of tty with panic()

merging printf() and panic() statements to be done incrementally.
2010-03-05 15:05:11 +00:00

139 lines
2.6 KiB
C

#define _MINIX 1
#define _SYSTEM 1
#include <minix/config.h>
#include <ansi.h>
#include <assert.h>
#include <sys/types.h>
#include <minix/const.h>
#include <minix/type.h>
#include <stdlib.h>
#include <unistd.h>
#include <minix/syslib.h>
#include <minix/sysutil.h>
#include <limits.h>
#include <errno.h>
#define ASYN_NR 100
PRIVATE asynmsg_t msgtable[ASYN_NR];
PRIVATE int first_slot= 0, next_slot= 0;
PUBLIC int asynsend3(dst, mp, fl)
endpoint_t dst;
message *mp;
int fl;
{
int r, src_ind, dst_ind;
unsigned flags;
static int first = 1;
static int inside = 0;
int len;
/* printf() causes asynsend? */
if(inside) {
exit(1);
}
inside = 1;
if(first) {
int i;
for(i = 0; i < ASYN_NR; i++) {
msgtable[i].flags = AMF_EMPTY;
}
first = 0;
}
/* Update first_slot */
for (; first_slot < next_slot; first_slot++)
{
flags= msgtable[first_slot].flags;
if ((flags & (AMF_VALID|AMF_DONE)) == (AMF_VALID|AMF_DONE))
{
if (msgtable[first_slot].result != OK)
{
#if 0
printf(
"asynsend: found completed entry %d with error %d\n",
first_slot,
msgtable[first_slot].result);
#endif
}
continue;
}
if (flags != AMF_EMPTY)
break;
}
if (first_slot >= next_slot)
{
/* Reset first_slot and next_slot */
next_slot= first_slot= 0;
}
if (next_slot >= ASYN_NR)
{
/* Tell the kernel to stop processing */
r= senda(NULL, 0);
if (r != OK)
panic("asynsend: senda failed: %d", r);
dst_ind= 0;
for (src_ind= first_slot; src_ind<next_slot; src_ind++)
{
flags= msgtable[src_ind].flags;
if ((flags & (AMF_VALID|AMF_DONE)) ==
(AMF_VALID|AMF_DONE))
{
if (msgtable[src_ind].result != OK)
{
#if 0
printf(
"asynsend: found completed entry %d with error %d\n",
src_ind,
msgtable[src_ind].result);
#endif
}
continue;
}
if (flags == AMF_EMPTY)
continue;
#if 0
printf("asynsend: copying entry %d to %d\n",
src_ind, dst_ind);
#endif
if (src_ind != dst_ind)
msgtable[dst_ind]= msgtable[src_ind];
dst_ind++;
}
first_slot= 0;
next_slot= dst_ind;
if (next_slot >= ASYN_NR)
panic("asynsend: msgtable full");
}
fl |= AMF_VALID;
msgtable[next_slot].dst= dst;
msgtable[next_slot].msg= *mp;
msgtable[next_slot].flags= fl; /* Has to be last. The kernel
* scans this table while we
* are sleeping.
*/
next_slot++;
assert(first_slot < ASYN_NR);
assert(next_slot >= first_slot);
len = next_slot-first_slot;
assert(first_slot + len <= ASYN_NR);
/* Tell the kernel to rescan the table */
r = senda(msgtable+first_slot, len);
inside = 0;
return r;
}