From e4211aa978606b9201dc0eb2399d1af6c010a46a Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Wed, 17 Mar 2021 17:21:52 +0100
Subject: [PATCH] c/src/proactor/epoll-internal.h: fix build on musl

Build with epoll proactor on musl is broken since at least version 0.23.0 and
https://github.com/apache/qpid-proton/commit/37136940e3077f25ce58c94775f48c66f666f4a8
because musl does not define PTHREAD_MUTEX_ADAPTIVE_NP resulting in the
following build failure:

In file included from /home/giuliobenetti/autobuild/run/instance-0/output-1/build/qpid-proton-0.33.0/c/src/proactor/epoll.c:60:
/home/giuliobenetti/autobuild/run/instance-0/output-1/build/qpid-proton-0.33.0/c/src/proactor/epoll-internal.h: In function 'pmutex_init':
/home/giuliobenetti/autobuild/run/instance-0/output-1/build/qpid-proton-0.33.0/c/src/proactor/epoll-internal.h:319:36: error: 'PTHREAD_MUTEX_ADAPTIVE_NP' undeclared (first use in this function); did you mean 'PTHREAD_MUTEX_STALLED'?
  319 |   pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP);
      |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~
      |                                    PTHREAD_MUTEX_STALLED

Fixes:
 - http://autobuild.buildroot.org/results/6a901b9ff68b7f52cabf8273d1017025fbd93b0d

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Upstream status: https://issues.apache.org/jira/browse/PROTON-2346]
---
 c/src/proactor/epoll-internal.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/c/src/proactor/epoll-internal.h b/c/src/proactor/epoll-internal.h
index e8c9f0a9..fa6a6f2a 100644
--- a/c/src/proactor/epoll-internal.h
+++ b/c/src/proactor/epoll-internal.h
@@ -315,7 +315,9 @@ static inline void pmutex_init(pthread_mutex_t *pm){
   pthread_mutexattr_t attr;
 
   pthread_mutexattr_init(&attr);
+#ifdef PTHREAD_MUTEX_ADAPTIVE_NP
   pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP);
+#endif
   if (pthread_mutex_init(pm, &attr)) {
     perror("pthread failure");
     abort();
-- 
2.30.1