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diff -up ksh-20120801/src/cmd/ksh93/include/jobs.h.locking ksh-20120801/src/cmd/ksh93/include/jobs.h
--- ksh-20120801/src/cmd/ksh93/include/jobs.h.locking 2014-06-27 15:51:07.144923719 +0200
+++ ksh-20120801/src/cmd/ksh93/include/jobs.h 2014-06-27 15:52:56.463272276 +0200
@@ -149,15 +149,18 @@ extern struct jobs job;
#define vmbusy() 0
#endif
-#define job_lock() (job.in_critical++)
+#define asoincint(p) __sync_fetch_and_add(p,1)
+#define asodecint(p) __sync_fetch_and_sub(p,1)
+
+#define job_lock() asoincint(&job.in_critical)
#define job_unlock() \
do { \
int sig; \
- if (!--job.in_critical && (sig = job.savesig)) \
+ if (asodecint(&job.in_critical)==1 && (sig = job.savesig)) \
{ \
- if (!job.in_critical++ && !vmbusy()) \
+ if (!asoincint(&job.in_critical) && !vmbusy()) \
job_reap(sig); \
- job.in_critical--; \
+ asodecint(&job.in_critical); \
} \
} while(0)
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