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sys_posix: support SCHED_FIFO and mlockall on more OSs

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Real-time scheduling and memory locking is available on posix compliant
OSs. This patch centralizes this functionality and brings support to
FreeBSD, NetBSD, and Solaris.

[ML: updated coding style]
This commit is contained in:
Stefan R. Filipek
2019-04-19 14:41:14 -04:00
committed by Miroslav Lichvar
parent a78031ce0d
commit c5c80ef400
7 changed files with 195 additions and 105 deletions
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67
sys_linux.c
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@@ -33,16 +33,6 @@
#include <sys/utsname.h>
#if defined(HAVE_PTHREAD_SETSCHEDPARAM)
# include <pthread.h>
# include <sched.h>
#endif
#if defined(HAVE_MLOCKALL)
# include <sys/mman.h>
#include <sys/resource.h>
#endif
#if defined(FEAT_PHC) || defined(HAVE_LINUX_TIMESTAMPING)
#include <linux/ptp_clock.h>
#endif
@@ -633,63 +623,6 @@ add_failed:
/* ================================================== */
#if defined(HAVE_PTHREAD_SETSCHEDPARAM)
/* Install SCHED_FIFO real-time scheduler with specified priority */
void SYS_Linux_SetScheduler(int SchedPriority)
{
int pmax, pmin;
struct sched_param sched;
if (SchedPriority < 1 || SchedPriority > 99) {
LOG_FATAL("Bad scheduler priority: %d", SchedPriority);
} else {
sched.sched_priority = SchedPriority;
pmax = sched_get_priority_max(SCHED_FIFO);
pmin = sched_get_priority_min(SCHED_FIFO);
if ( SchedPriority > pmax ) {
sched.sched_priority = pmax;
}
else if ( SchedPriority < pmin ) {
sched.sched_priority = pmin;
}
if ( pthread_setschedparam(pthread_self(), SCHED_FIFO, &sched) == -1 ) {
LOG(LOGS_ERR, "pthread_setschedparam() failed");
}
else {
DEBUG_LOG("Enabled SCHED_FIFO with priority %d",
sched.sched_priority);
}
}
}
#endif /* HAVE_PTHREAD_SETSCHEDPARAM */
#if defined(HAVE_MLOCKALL)
/* Lock the process into RAM so that it will never be swapped out */
void SYS_Linux_MemLockAll(int LockAll)
{
struct rlimit rlim;
if (LockAll == 1 ) {
/* Make sure that we will be able to lock all the memory we need */
/* even after dropping privileges. This does not actually reaerve any memory */
rlim.rlim_max = RLIM_INFINITY;
rlim.rlim_cur = RLIM_INFINITY;
if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0) {
LOG(LOGS_ERR, "setrlimit() failed: not locking into RAM");
}
else {
if (mlockall(MCL_CURRENT|MCL_FUTURE) < 0) {
LOG(LOGS_ERR, "mlockall() failed");
}
else {
DEBUG_LOG("Successfully locked into RAM");
}
}
}
}
#endif /* HAVE_MLOCKALL */
/* ================================================== */
int
SYS_Linux_CheckKernelVersion(int req_major, int req_minor)
{