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Make init_spin_delay() C89 compliant and change stuck spinlock reporting.

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The current definition of init_spin_delay (introduced recently in
48354581a) wasn't C89 compliant. It's not legal to refer to refer to
non-constant expressions, and the ptr argument was one.  This, as
reported by Tom, lead to a failure on buildfarm animal pademelon.

The pointer, especially on system systems with ASLR, isn't super helpful
anyway, though. So instead of making init_spin_delay into an inline
function, make s_lock_stuck() report the function name in addition to
file:line and change init_spin_delay() accordingly. While not a direct
replacement, the function name is likely more useful anyway (line
numbers are often hard to interpret in third party reports).

This also fixes what file/line number is reported for waits via
s_lock().

As PG_FUNCNAME_MACRO is now used outside of elog.h, move it to c.h.

Reported-By: Tom Lane
Discussion: 4369.1460435533@sss.pgh.pa.us
This commit is contained in:
Andres Freund
2016-04-13 16:42:01 -07:00
parent 6cead413bb
commit 80abbeba23
6 changed files with 29 additions and 27 deletions
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11
src/include/c.h
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@@ -169,6 +169,17 @@
#define dummyret char
#endif
/* Which __func__ symbol do we have, if any? */
#ifdef HAVE_FUNCNAME__FUNC
#define PG_FUNCNAME_MACRO __func__
#else
#ifdef HAVE_FUNCNAME__FUNCTION
#define PG_FUNCNAME_MACRO __FUNCTION__
#else
#define PG_FUNCNAME_MACRO NULL
#endif
#endif
/* ----------------------------------------------------------------
* Section 2: bool, true, false, TRUE, FALSE, NULL
* ----------------------------------------------------------------