semUtils.hpp File Reference

XWC app semaphore Utilities. More...

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Macros
#define	XWC_SEM_WAIT_TS_RETVOID(ts, sec, nsec)
	Add the wait time to a timespec for a sem_timedwait call, with no value returned on error. More...
#define	XWC_SEM_WAIT_TS(ts, sec, nsec)
	Add the wait time to a timespec for a sem_timedwait call, with -1 returned on error. More...
#define	XWC_SEM_TIMEDWAIT_LOOP(sem, ts)
	Perform a sem_timedwait in the context of a standard loop in MagAO-X code. More...
#define	XWC_SEM_FLUSH(sem)

Detailed Description

XWC app semaphore Utilities.

Author

Jared R. Males (jared.nosp@m.male.nosp@m.s@gma.nosp@m.il.c.nosp@m.om)

Definition in file semUtils.hpp.

Macro Definition Documentation

XWC_SEM_FLUSH

#define XWC_SEM_FLUSH

(

sem

)

Value:

{                                                                                     \
    int semval;                                                                       \
    if(sem_getvalue( &sem, &semval)<0)                                                \
    {                                                                                 \
        return log<software_error,-1>({__FILE__, __LINE__,errno, "sem_getvalue"});    \
    }                                                                                 \
    for(int i = 0; i < semval; ++i)                                                   \
    {                                                                                 \
        if(sem_trywait(&sem) != 0)                                                    \
        {                                                                             \
            if(errno == EAGAIN) break;                                                \
            return log<software_error,-1>({__FILE__, __LINE__,errno, "sem_trywait"}); \
        }                                                                             \
    }                                                                                 \
}

Definition at line 66 of file semUtils.hpp.

XWC_SEM_TIMEDWAIT_LOOP

#define XWC_SEM_TIMEDWAIT_LOOP	(		sem,
			ts
	)

Value:

    if(sem_timedwait(&sem, &ts) != 0)                                                        \
    {                                                                                        \
        /* Check for why we timed out */                                                     \
        /* EINTER probably indicates time to shutdown, loop wil exit if m_shutdown is set */ \
        /* ETIMEDOUT just means keep waiting */                                              \
        if(errno == EINTR || errno == ETIMEDOUT) continue;                                   \
                                                                                             \
        /*Otherwise, report an error.*/                                                      \
        log<software_error>({__FILE__, __LINE__,errno, "sem_timedwait"});                    \
        break;                                                                               \
    }

Perform a sem_timedwait in the context of a standard loop in MagAO-X code.

Parameters

sem	the semaphore
ts	the timespec with the time to wait until

Definition at line 53 of file semUtils.hpp.

XWC_SEM_WAIT_TS

#define XWC_SEM_WAIT_TS	(		ts,
			sec,
			nsec
	)

Value:

    if(clock_gettime(CLOCK_REALTIME, &ts) < 0)                               \
    {                                                                        \
        log<software_critical>({__FILE__,__LINE__,errno,0,"clock_gettime"}); \
        return -1;                                                           \
    }                                                                        \
    ts.tv_sec += sec;                                                        \
    mx::sys::timespecAddNsec(ts, nsec);

Add the wait time to a timespec for a sem_timedwait call, with -1 returned on error.

An error would be generated by clock_gettime

Parameters

ts	is the timespec to modify, should be set to current time
sec	is the number of seconds to add to ts
nsec	is the number of nanoseconds to add to ts

Definition at line 38 of file semUtils.hpp.

XWC_SEM_WAIT_TS_RETVOID

#define XWC_SEM_WAIT_TS_RETVOID	(		ts,
			sec,
			nsec
	)

Value:

    if(clock_gettime(CLOCK_REALTIME, &ts) < 0)                               \
    {                                                                        \
        log<software_critical>({__FILE__,__LINE__,errno,0,"clock_gettime"}); \
        return; /*will trigger a shutdown*/                                  \
    }                                                                        \
    ts.tv_sec += sec;                                                        \
    mx::sys::timespecAddNsec(ts, nsec);

Add the wait time to a timespec for a sem_timedwait call, with no value returned on error.

An error would be generated by clock_gettime.

Parameters

ts	is the timespec to modify, should be set to current time
sec	is the number of seconds to add to ts
nsec	is the number of nanoseconds to add to ts

Definition at line 20 of file semUtils.hpp.