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epicsThreadRealtimeLock: clarify errors

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give some more descriptive, linux specific, error messages
This commit is contained in:
Michael Davidsaver
2017-12-08 12:47:45 -05:00
parent 716f102dd6
commit 3c2fe264cd
1 changed files with 18 additions and 3 deletions
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21
modules/libcom/src/osi/os/posix/osdThread.c
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@@ -422,9 +422,24 @@ void epicsThreadRealtimeLock(void)
int status = mlockall(MCL_CURRENT | MCL_FUTURE);
if (status) {
fprintf(stderr, "epicsThreadRealtimeLock "
"Warning: Unable to lock the virtual address space.\n"
"VM page faults may harm real-time performance.\n");
const int err = errno;
switch(err) {
#ifdef __linux__
case ENOMEM:
fprintf(stderr, "epicsThreadRealtimeLock "
"Warning: unable to lock memory. RLIMIT_MEMLOCK is too small or missing CAP_IPC_LOCK\n");
break;
case EPERM:
fprintf(stderr, "epicsThreadRealtimeLock "
"Warning: unable to lock memory. missing CAP_IPC_LOCK\n");
break;
#endif
default:
fprintf(stderr, "epicsThreadRealtimeLock "
"Warning: Unable to lock the virtual address space.\n"
"VM page faults may harm real-time performance. errno=%d\n",
err);
}
}
}
#endif