semUtilsDerived.hpp File Reference

XWC app semaphore Utilities to use CRTP derived classes. More...

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Macros
#define	XWC_SEM_WAIT_TS_RETVOID_DERIVED(ts, sec, nsec)
	Add the wait time to a timespec for a sem_timedwait call, with no value returned on error, using the derived class.
#define	XWC_SEM_WAIT_TS_DERIVED(ts, sec, nsec)
	Add the wait time to a timespec for a sem_timedwait call, with -1 returned on error.
#define	XWC_SEM_TIMEDWAIT_LOOP_DERIVED(sem, ts)
	Perform a sem_timedwait in the context of a standard loop in MagAO-X code using the derived class.
#define	XWC_SEM_FLUSH_DERIVED(sem)

Detailed Description

XWC app semaphore Utilities to use CRTP derived classes.

Author

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

Definition in file semUtilsDerived.hpp.

Macro Definition Documentation

XWC_SEM_FLUSH_DERIVED

#define XWC_SEM_FLUSH_DERIVED

(

sem

)

Value:

{                                                                                     \
    int semval;                                                                       \
    if(sem_getvalue( &sem, &semval)<0)                                                \
    {                                                                                 \
        return derivedT::template 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 derivedT::template log<software_error,-1>({__FILE__, __LINE__,errno, "sem_trywait"}); \
        }                                                                             \
    }                                                                                 \
}

Definition at line 65 of file semUtilsDerived.hpp.

XWC_SEM_TIMEDWAIT_LOOP_DERIVED

#define XWC_SEM_TIMEDWAIT_LOOP_DERIVED	(		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.*/                                                      \
        derivedT::template log<software_error>({__FILE__, __LINE__,errno, "sem_timedwait"}); \
        break;                                                                               \
    }

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

Parameters

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

Definition at line 52 of file semUtilsDerived.hpp.

XWC_SEM_WAIT_TS_DERIVED

#define XWC_SEM_WAIT_TS_DERIVED	(		ts,
			sec,
			nsec
	)

Value:

    if(clock_gettime(CLOCK_REALTIME, &ts) < 0)                               \
    {                                                                        \
        derivedT::template 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 37 of file semUtilsDerived.hpp.

XWC_SEM_WAIT_TS_RETVOID_DERIVED

#define XWC_SEM_WAIT_TS_RETVOID_DERIVED	(		ts,
			sec,
			nsec
	)

Value:

    if(clock_gettime(CLOCK_REALTIME, &ts) < 0)                                                  \
    {                                                                                           \
        derivedT::template 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, using the derived class.

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 semUtilsDerived.hpp.