That works now for me without clicks and crackling.
Good that you found a workaround!
Just keep in mind that this doesn't fix the underlying issue, namely
that the process() method can't take a reader lock.
As I said, the network threads only take reader locks, so they should
never block the process() method. The methods that do take a writer lock
are never called in parallel with the process() method, at least not in
the Pd version.
I see two potential problems:
1. I made a mistake somewhere and accidentally take a writer lock. I
don't think this is the case. I checked every lock of update_mutex in
aoo/src/source.cpp and everything looks fine. Also, if there really was
a problem with the code, it should affect every platform, not only SGI.
2. The aoo::shared_mutex implementation is broken on SGI.
Actually, aoo::shared_mutex has several implementations. On SGI it
should use pthread_rwlock if available, or fall back to
std::shared_mutex otherwise. Can you check if AOO_HAVE_PTHREAD_RWLOCK is
defined resp. check the value of the (internal) AOO_HAVE_PTHREAD_RWLOCK
CMake cache variable?
Christof
On 7/19/2026 7:43 PM, Wolfgang Gaggl via Pd-list wrote:
...sent that last reply to quickly.
added a poor-mans pause_cpu() implementation for the above lock retry case:
inline void pause_cpu() {
#if defined(_MSC_VER)
YieldProcessor();
#elif defined(__SSE2__)
_mm_pause();
#elif defined(__aarch64__)
__asm__ __volatile__("isb");
#elif defined(__arm__)
__asm__ __volatile__("yield");
#elif defined(__mips__)
# if (defined(_MIPS_ARCH_MIPS32R2) || defined(_MIPS_ARCH_MIPS64R2)) || \
(defined(__mips_isa_rev) && __mips_isa_rev >= 2)
// MIPS32r2+: PAUSE instruction (architectural spin-loop hint)
__asm__ __volatile__(".set push\n\t"
".set mips32r2\n\t"
"pause\n\t"
".set pop");
# else
// MIPS4 / R10000 / R12000: SSNOP (SuperScalar NO-OP)
// Encoding: sll $0,$0,1 (sa=1 distinguishes SSNOP from plain NOP sa=0)
// Writing to $0 is a no-op data-wise; the sa=1 field tells the CPU not to
// dual-issue the following instruction, reducing bus pressure in spin
loops.
__asm__ __volatile__("sll $0,$0,1");
# endif
That works now for me without clicks and crackling.
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