author | hgs |
Wed, 13 Oct 2010 19:39:18 +0530 | |
changeset 71 | 28ccaba883f4 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/** @file ../include/setjmp.h |
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@internalComponent |
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*/ |
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/** @fn longjmp(jmp_buf __jmpb, int __retval) |
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@param __jmpb |
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@param __retval |
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Refer to setjmp() for the documentation |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @fn setjmp(jmp_buf __jmpb) |
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@param __jmpb |
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Note: This description also covers the following functions - |
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longjmp() _setjmp() _longjmp() |
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@return If the return is from a direct invocation, the setjmp function returns 0. If the return is from a call to longjmp(), |
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setjmp() returns a non-zero value. |
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After the longjmp is completed, program execution continues as if |
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the corresponding invocation of setjmp() had just returned the |
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value specified by __retval. If __retval is 0, setjmp() returns 1. |
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The setjmp, and _setjmp functions save their calling environment in __jmpb. Each of these functions returns 0. |
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The corresponding longjmp functions restore the environment saved by their most recent respective |
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invocations |
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of the setjmp function. |
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They then return so that program execution continues as if the corresponding |
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invocation of the setjmp call had just returned the value specified by __retval, instead of 0. |
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The longjmp routines may not be called after the routine which called the setjmp routines returns. |
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All accessible objects have values as of the time longjmp routine was called, except that the values of objects of automatic storage |
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invocation duration that do not have the volatile |
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type and have been changed between the setjmp invocation and longjmp call are indeterminate. |
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The setjmp / longjmp pairs save and restore the signal mask while _setjmp / _longjmp pairs save and restore only the register set and the stack. |
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Examples: |
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@code |
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#include <setjmp.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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static void f1( int, int, int ); |
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static void f2( void ); |
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static jmp_buf jmpbuffer; |
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int main() |
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{ |
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int count; |
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register int val; |
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volatile int sum; |
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count = 2; val = 3; sum = 4; |
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if ( setjmp( jmpbuffer ) != 0 ) |
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{ |
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printf("in main: count = %d, val = %d, sum = %d |
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", count, val, sum ); |
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exit(0); |
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} |
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f1(97, 98, 99 ); |
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return 0; |
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} |
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static void f1 (int i, int j, int k ) |
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{ |
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printf("in f1: count = %d, val = %d, sum = %d |
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", i, j , k ); |
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f2(); |
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} |
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static void f2( void ) |
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{ |
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longjmp( jmpbuffer, 1 ); |
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} |
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@endcode |
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Output |
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@code |
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in f1: count = 97, val = 98, sum = 99 |
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in main: count = 2, val = 3, sum = 4 |
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@endcode |
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Limitations: |
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The signal related functionalities aren't applicable to the Symbian |
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OS implementation as there is no support for signals. This means that the setjmp and _setjmp routines have the same functionality and so do longjmp and _longjmp . |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def _setjmp |
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The _longjmp() and _setjmp() functions shall be equivalent to longjmp() and setjmp(), respectively, with the additional restriction that _longjmp() and _setjmp() shall not manipulate the signal mask. |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def _longjmp |
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The _longjmp() and _setjmp() functions shall be equivalent to longjmp() and setjmp(), respectively, with the additional restriction that _longjmp() and _setjmp() shall not manipulate the signal mask. |
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@publishedAll |
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@externallyDefinedApi |
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*/ |