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authorUlrich Drepper <drepper@redhat.com>2000-04-25 07:40:56 +0000
committerUlrich Drepper <drepper@redhat.com>2000-04-25 07:40:56 +0000
commitd472655c75767d8a5956a01435f769c71db499b7 (patch)
treeba80dd709a781c5495878f1723d626107911d684 /elf
parent128e2b0f0e11f60af8587ed86353d9e8442b1e38 (diff)
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Update.
2000-04-25 Ulrich Drepper <drepper@redhat.com> * elf/dl-profile.c (_dl_mcount): Try to be thread-safe while not setting the state to GMON_PROF_BUSY.
Diffstat (limited to 'elf')
-rw-r--r--elf/dl-profile.c25
1 files changed, 16 insertions, 9 deletions
diff --git a/elf/dl-profile.c b/elf/dl-profile.c
index 023ac1783b..5d69b718e1 100644
--- a/elf/dl-profile.c
+++ b/elf/dl-profile.c
@@ -154,11 +154,11 @@ struct here_fromstruct
uint16_t link;
};
-static uint16_t *tos;
+static volatile uint16_t *tos;
static struct here_fromstruct *froms;
-static size_t fromlimit;
-static size_t fromidx;
+static uint32_t fromlimit;
+static volatile uint32_t fromidx;
static uintptr_t lowpc;
static size_t textsize;
@@ -431,12 +431,15 @@ _dl_start_profile (struct link_map *map, const char *output_dir)
void
_dl_mcount (ElfW(Addr) frompc, ElfW(Addr) selfpc)
{
- uint16_t *topcindex;
+ volatile uint16_t *topcindex;
size_t i, fromindex;
struct here_fromstruct *fromp;
+#if 0
+ /* XXX I think this is now not necessary anymore. */
if (! compare_and_swap (&state, GMON_PROF_ON, GMON_PROF_BUSY))
return;
+#endif
/* Compute relative addresses. The shared object can be loaded at
any address. The value of frompc could be anything. We cannot
@@ -491,31 +494,32 @@ _dl_mcount (ElfW(Addr) frompc, ElfW(Addr) selfpc)
size_t newfromidx;
to_index = (data[narcs].self_pc
/ (hashfraction * sizeof (*tos)));
- newfromidx = fromidx++;
+ newfromidx = exchange_and_add (&fromidx, 1) + 1;
froms[newfromidx].here = &data[narcs];
froms[newfromidx].link = tos[to_index];
tos[to_index] = newfromidx;
- ++narcs;
+ atomic_add (&narcs, 1);
}
/* If we still have no entry stop searching and insert. */
if (*topcindex == 0)
{
- size_t newarc = 1 + exchange_and_add (narcsp, 1);
+ uint_fast32_t newarc = 1 + exchange_and_add (narcsp, 1);
/* In rare cases it could happen that all entries in FROMS are
occupied. So we cannot count this anymore. */
if (newarc >= fromlimit)
goto done;
- fromp = &froms[*topcindex = fromidx++];
+ *topcindex = exchange_and_add (&fromidx, 1) + 1;
+ fromp = &froms[*topcindex];
fromp->here = &data[newarc];
data[newarc].from_pc = frompc;
data[newarc].self_pc = selfpc;
data[newarc].count = 0;
fromp->link = 0;
- ++narcs;
+ atomic_add (&narcs, 1);
break;
}
@@ -531,5 +535,8 @@ _dl_mcount (ElfW(Addr) frompc, ElfW(Addr) selfpc)
atomic_add (&fromp->here->count, 1);
done:
+#if 0
+ /* XXX See above, Shouldn't be necessary anymore. */
state = GMON_PROF_ON;
+#endif
}