IntelÂ® Fortran Libraries Reference

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2 Intel Fortran Libraries ReferenceWhen an interrupt occurs, except a SIG$FPE interrupt, the sig argument SIG$INT is passed tofunc, and then func is executed.When a SIG$FPE interrupt occurs, the function func is passed two arguments: SIG$FPE and thefloating-point error code (for example, FPE$ZERODIVIDE or FPE$OVERFLOW) whichidentifies the type of floating-point exception that occurred. The floating-point error codes beginwith the prefix FPE$ and are defined in IFPORT.F90. Floating-point exceptions are described anddiscussed in "The Floating-Point Environment" in your user’s guide.If func returns, the calling process resumes execution immediately after the point at which itreceived the interrupt signal. This is true regardless of the type of interrupt or operating mode.Because signal-handler routines are normally called asynchronously when an interrupt occurs, it ispossible that your signal-handler function will get control when a run-time operation is incompleteand in an unknown state. Therefore, do not call heap routines or any routine that uses the heaproutines (for example, I/O routines, ALLOCATE, and DEALLOCATE).To test your signal handler routine you can generate interrupt signals by calling RAISEQQ, whichcauses your program either to branch to the signal handlers set with SIGNALQQ, or to performthe system default behavior if SIGNALQQ has set no signal handler.The example below demonstrates a signal handler for SIG$ABORT. A sample signal handler forSIG$FPE is given in "Handling Floating-Point Exceptions" in your user’s guide.CompatibilityCONSOLE STANDARD GRAPHICS QUICKWIN GRAPHICS WINDOWS DLL LIBSee Also: “RAISEQQ”, “SIGNAL”, “KILL”, “GETEXCEPTIONPTRSQQ”Example! This program shows a signal handler for! SIG$ABORTUSE IFPORTINTERFACEFUNCTION h_abort (signum)!DEC$ ATTRIBUTES C :: h_abortINTEGER(4) h_abortINTEGER(2) signumEND FUNCTIONEND INTERFACEINTEGER(2) i2retINTEGER(4) i4ret2-444
Descriptions of the Library Routines 2i4ret = SIGNALQQ(SIG$ABORT, h_abort)WRITE(*,*) 'Set signal handler. Return = ', i4reti2ret = RAISEQQ(SIG$ABORT)WRITE(*,*) 'Raised signal. Return = ', i2retEND!! Signal handler routine!INTEGER(4) FUNCTION h_abort (signum)!DEC$ ATTRIBUTES C :: h_abortINTEGER(2) signumWRITE(*,*) 'In signal handler for SIG$ABORT'WRITE(*,*) 'signum = ', signumh_abort = 1ENDSLEEPPortability Subroutine: Suspends the execution of a process for a specified interval.Module: USE IFPORTSyntaxCALL SLEEP (time)time(Input) INTEGER(4). Length of time, in seconds, to suspend the calling process.CompatibilityCONSOLE STANDARD GRAPHICS QUICKWIN GRAPHICS WINDOWS DLL LIBSee Also: “SLEEPQQ”ExampleUSE IFPORTinteger(4) hold_timehold_time = 1 !lets the loop executeDO WHILE (hold_time .NE. 0)write(*,'(A)') "Enter the number of seconds to suspend"read(*,*) hold_timeCALL SLEEP (hold_time)2-445
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Intel ® FortranLibraries Reference
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Overview of the Libraries 1This cha
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