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16-Bit Language Tools Libraries
2.9
<SETJMP.H> NON-LOCAL JUMPS
The header file setjmp.h consists of a type, a macro and a function that allow control
transfers to occur that bypass the normal function call and return process.
jmp_buf
Description:
Include:
Prototype:
Remarks:
A type that is an array used by setjmp and longjmp to save and
restore the program environment.
<setjmp.h>
typedef int jmp_buf[_NSETJMP];
_NSETJMP is defined as 16 + 2 that represents 16 registers and a
32-bit return address.
setjmp
DS51456E-page 32
Description:
Include:
Prototype:
Argument:
Return Value:
Example:
longjmp
Description:
Include:
Prototype:
Arguments:
Remarks:
A macro that saves the current state of the program for later use by
longjmp.
<setjmp.h>
#define setjmp(jmp_buf env )
env variable where environment is stored
If the return is from a direct call, setjmp returns zero. If the return is
from a call to longjmp , setjmp returns a non-zero value.
Note: If the argument val from longjmp is 0, setjmp returns 1.
See longjmp .
A function that restores the environment saved by setjmp.
<setjmp.h>
void longjmp(jmp_buf env , int val );
env variable where environment is stored
val value to be returned to setjmp call.
The value parameter val should be non-zero. If longjmp is invoked
from a nested signal handler (that is, invoked as a result of a signal
raised during the handling of another signal), the behavior is undefined.
? 2008 Microchip Technology Inc.
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相关PDF资料
SW006015
C COMPILER MPLAB C32
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
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