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libsysprof-capture: sleep and try again to get an event

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Unless we've failed before, then just bail immediately so that applications
which loose their controller keep running with minimal overhead.
This commit is contained in:
Christian Hergert
2023-08-15 15:37:24 -07:00
parent b96bf5c969
commit c45aba997d
1 changed files with 28 additions and 17 deletions
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11
src/libsysprof-capture/mapped-ring-buffer.c
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@ -69,6 +69,7 @@ struct _MappedRingBuffer
void *map; void *map;
size_t body_size; size_t body_size;
size_t page_size; size_t page_size;
unsigned has_failed : 1;
}; };
static inline MappedRingHeader * static inline MappedRingHeader *
@ -405,6 +406,8 @@ mapped_ring_buffer_allocate (MappedRingBuffer *self,
assert (length < self->body_size); assert (length < self->body_size);
assert ((length & 0x7) == 0); assert ((length & 0x7) == 0);
for (unsigned i = 0; i < 1000; i++)
{
header = get_header (self); header = get_header (self);
__atomic_load (&header->head, &headpos, __ATOMIC_SEQ_CST); __atomic_load (&header->head, &headpos, __ATOMIC_SEQ_CST);
__atomic_load (&header->tail, &tailpos, __ATOMIC_SEQ_CST); __atomic_load (&header->tail, &tailpos, __ATOMIC_SEQ_CST);
@ -427,6 +430,14 @@ mapped_ring_buffer_allocate (MappedRingBuffer *self,
if (tailpos + length < headpos) if (tailpos + length < headpos)
return get_body_at_pos (self, tailpos); return get_body_at_pos (self, tailpos);
if (self->has_failed)
break;
usleep (1000); /* 1 msec */
}
self->has_failed = true;
return NULL; return NULL;
} }