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retries 120 times to find the MPB

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=> afterwards we give up and deliver a NULL pointer
This commit is contained in:
Stefan Lankes 2015-10-18 10:22:52 +02:00
parent c2ea9dd1a9
commit 30b3166155
1 changed files with 23 additions and 13 deletions
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36
hermit/kernel/syscall.c
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@ -295,7 +295,7 @@ out:
static int sys_msleep(unsigned int msec)
{
timer_wait(msec*TIMER_FREQ/1000);
timer_wait((msec*TIMER_FREQ)/1000);
return 0;
}
@ -443,25 +443,31 @@ out:
static size_t sys_rcce_malloc(int session_id, int ue)
{
size_t vaddr = 0;
int i;
int i, counter = 0;
if (session_id <= 0)
return -EINVAL;
for(i=0; i<MAX_RCCE_SESSIONS; i++)
{
if (rcce_mpb[i].id == session_id)
break;
}
// after 120 retries (= 120*300 ms) we give up
do {
for(i=0; i<MAX_RCCE_SESSIONS; i++)
{
if ((rcce_mpb[i].id == session_id) && rcce_mpb[i].mpb[ue])
break;
}
if (i >= MAX_RCCE_SESSIONS) {
counter++;
timer_wait((300*TIMER_FREQ)/1000);
}
} while((i >= MAX_RCCE_SESSIONS) && (counter < 120));
//kprintf("i = %d, counter = %d, max %d\n", i, counter, MAX_RCCE_SESSIONS);
// create new session
if (i >= MAX_RCCE_SESSIONS)
goto out;
if (!rcce_mpb[i].mpb[ue])
goto out;
vaddr = vma_alloc(2*PAGE_SIZE, VMA_READ|VMA_WRITE|VMA_USER|VMA_CACHEABLE);
if (BUILTIN_EXPECT(!vaddr, 0))
goto out;
@ -470,11 +476,15 @@ static size_t sys_rcce_malloc(int session_id, int ue)
vma_free(vaddr, vaddr + 2*PAGE_SIZE);
goto out;
}
kprintf("Map MPB of session %d at 0x%zx, using of slot %d, isle %d\n", session_id, vaddr, i, ue);
out:
return vaddr;
out:
kprintf("Didn't find a valid MPB for session %d, isle %d\n", session_id, ue);
return 0;
}
static int sys_rcce_fini(int session_id)