X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/215ed67257173f5e26c9489ec96c4ced08d1614a..5bd975f6b207038a9e62a96346522060e8e5cf6e:/include/xbt/ex.h diff --git a/include/xbt/ex.h b/include/xbt/ex.h index f1bc41c884..1f7e538716 100644 --- a/include/xbt/ex.h +++ b/include/xbt/ex.h @@ -1,6 +1,16 @@ -/* -** OSSP ex - Exception Handling (modified to fit into SimGrid) -** Copyright (c) 2005 Martin Quinson. +/* ex - Exception Handling */ + +/* Copyright (c) 2005-2010 The SimGrid team */ +/* Copyright (c) 2002-2004 Ralf S. Engelschall */ +/* Copyright (c) 2002-2004 The OSSP Project */ +/* Copyright (c) 2002-2004 Cable & Wireless */ +/* All rights reserved. */ + +/* This code is inspirated from the OSSP version (as retrieved back in 2004)*/ +/* It was heavily modified to fit the SimGrid framework. */ + +/* The OSSP version has the following copyright notice: +** OSSP ex - Exception Handling ** Copyright (c) 2002-2004 Ralf S. Engelschall ** Copyright (c) 2002-2004 The OSSP Project ** Copyright (c) 2002-2004 Cable & Wireless @@ -13,7 +23,7 @@ ** the above copyright notice and this permission notice appear in all ** copies. ** -** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED +** THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESSED OR IMPLIED ** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF ** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. ** IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR @@ -25,57 +35,69 @@ ** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ** OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF ** SUCH DAMAGE. -** -** ex.h: exception handling (pre-processor part) -*/ + */ + +/* The extensions made for the SimGrid project can either be distributed */ +/* under the same license, or under the LGPL v2.1 */ #ifndef __XBT_EX_H__ #define __XBT_EX_H__ -#include -#include +#include "xbt/sysdep.h" +#include "xbt/misc.h" +#include "xbt/virtu.h" -/* do not include execinfo.h directly since it's not always available. - Instead, copy the parts we need (and fake when it's not there) */ -extern int backtrace (void **__array, int __size); +SG_BEGIN_DECL() -/* required ISO-C standard facilities */ +/*-*-* Emergency debuging: define this when the exceptions get crazy *-*-*/ +#undef __EX_MAYDAY +#ifdef __EX_MAYDAY +# include #include -#include - -/* the machine context */ +# define MAYDAY_SAVE(m) printf("%d %s:%d save %p\n", \ + (*xbt_getpid)(),__FILE__,__LINE__, \ + (m)->jb \ + ), +# define MAYDAY_RESTORE(m) printf("%d %s:%d restore %p\n", \ + (*xbt_getpid)(),__FILE__,__LINE__, \ + (m)->jb \ + ), +# define MAYDAY_CATCH(e) printf("%d %s:%d Catched '%s'\n", \ + (*xbt_getpid)(),__FILE__,__LINE__, \ + e.msg \ + ), +#else +# define MAYDAY_SAVE(m) +# define MAYDAY_RESTORE(m) +# define MAYDAY_CATCH(e) +#endif +/*-*-* end of debugging stuff *-*-*/ #if defined(__EX_MCTX_MCSC__) -#include /* POSIX.1 ucontext(3) */ +#include /* POSIX.1 ucontext(3) */ #define __ex_mctx_struct ucontext_t uc; #define __ex_mctx_save(mctx) (getcontext(&(mctx)->uc) == 0) -#define __ex_mctx_restored(mctx) /* noop */ +#define __ex_mctx_restored(mctx) /* noop */ #define __ex_mctx_restore(mctx) (void)setcontext(&(mctx)->uc) - #elif defined(__EX_MCTX_SSJLJ__) -#include /* POSIX.1 sigjmp_buf(3) */ +#include /* POSIX.1 sigjmp_buf(3) */ #define __ex_mctx_struct sigjmp_buf jb; #define __ex_mctx_save(mctx) (sigsetjmp((mctx)->jb, 1) == 0) -#define __ex_mctx_restored(mctx) /* noop */ +#define __ex_mctx_restored(mctx) /* noop */ #define __ex_mctx_restore(mctx) (void)siglongjmp((mctx)->jb, 1) - -#elif defined(__EX_MCTX_SJLJ__) || !defined(__EX_MCTX_CUSTOM__) -#include /* ISO-C jmp_buf(3) */ +#elif defined(__EX_MCTX_SJLJ__) || !defined(__EX_MCTX_CUSTOM__) || defined(__EX_MAYDAY) +#include /* ISO-C jmp_buf(3) */ #define __ex_mctx_struct jmp_buf jb; -#define __ex_mctx_save(mctx) (setjmp((mctx)->jb) == 0) -#define __ex_mctx_restored(mctx) /* noop */ -#define __ex_mctx_restore(mctx) (void)longjmp((mctx)->jb, 1) +#define __ex_mctx_save(mctx) ( MAYDAY_SAVE(mctx) setjmp((mctx)->jb) == 0) +#define __ex_mctx_restored(mctx) /* noop */ +#define __ex_mctx_restore(mctx) ( MAYDAY_RESTORE(mctx) (void)longjmp((mctx)->jb, 1)) #endif - /* declare the machine context type */ -typedef struct { __ex_mctx_struct } __ex_mctx_t; - +typedef struct { +__ex_mctx_struct} __ex_mctx_t; + /** @addtogroup XBT_ex * @brief A set of macros providing exception a la C++ in ANSI C (grounding feature) * - *
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- * * This module is a small ISO-C++ style exception handling library * for use in the ISO-C language. It allows you to use the paradigm * of throwing and catching exceptions in order to reduce the amount @@ -92,12 +114,16 @@ typedef struct { __ex_mctx_struct } __ex_mctx_t; * These features are brought to you by a modified version of the libex * library, one of the numerous masterpiece of Ralf S. Engelschall. * + * \htmlonly
\endhtmlonly + * * @section XBT_ex_toc TABLE OF CONTENTS * * - \ref XBT_ex_intro * - \ref XBT_ex_base * - \ref XBT_ex_pitfalls * + * \htmlonly
\endhtmlonly + * * @section XBT_ex_intro DESCRIPTION * * In SimGrid, an exception is a triple <\a msg , \a category , \a value> @@ -107,7 +133,7 @@ typedef struct { __ex_mctx_struct } __ex_mctx_t; * * @section XBT_ex_base BASIC USAGE * - * \em TRY \b TRIED_BLOCK [\em CLEANUP \b CLEANUP_BLOCK] \em CATCH (variable) \b CATCH_BLOCK + * \em TRY \b TRIED_BLOCK [\em TRY_CLEANUP \b CLEANUP_BLOCK] \em CATCH (variable) \b CATCH_BLOCK * * This is the primary syntactical construct provided. It is modeled after the * ISO-C++ try-catch clause and should sound familiar to most of you. @@ -120,7 +146,7 @@ typedef struct { __ex_mctx_struct } __ex_mctx_t; * * * In absence of exception, the control flow goes into the blocks TRIED_BLOCK - * and CLEANUP_BLOCK (if present); The CATCH_BLOCK block is then ignored. + * and CLEANUP_BLOCK (if present); The CATCH_BLOCK block is then ignored. * * When an exception is thrown, the control flow goes through the following * blocks: TRIED_BLOCK (up to the statement throwing the exception), @@ -139,12 +165,23 @@ typedef struct { __ex_mctx_struct } __ex_mctx_t; * CATCH clauses. * - it is possible to nest TRY clauses. * - * The TRY block is a regular ISO-C language statement block, but it is not + * The TRY block is a regular ISO-C language statement block, but + * + *
it is not * allowed to jump into it via "goto" or longjmp(3) or out of it via "break", - * "return", "goto" or longjmp(3) because there is some hidden setup and + * "return", "goto" or longjmp(3).
+ * + * This is because there is some hidden setup and * cleanup that needs to be done regardless of whether an exception is * caught. Bypassing these steps will break the exception handling facility. - * + * The symptom are likely to be a segfault at the next exception raising point, + * ie far away from the point where you did the mistake. If you suspect + * that kind of error in your code, have a look at the little script + * tools/xbt_exception_checker in the CVS. It extracts all the TRY + * blocks from a set of C files you give it and display them (and only + * them) on the standard output. You can then grep for the forbidden + * keywords on that output. + * * The CLEANUP and CATCH blocks are regular ISO-C language statement * blocks without any restrictions. You are even allowed to throw (and, in the * CATCH block, to re-throw) exceptions. @@ -152,7 +189,7 @@ typedef struct { __ex_mctx_struct } __ex_mctx_t; * There is one subtle detail you should remember about TRY blocks: * Variables used in the CLEANUP or CATCH clauses must be declared with * the storage class "volatile", otherwise they might contain outdated - * information if an exception it thrown. + * information if an exception is thrown. * * * This is because you usually do not know which commands in the TRY @@ -170,7 +207,7 @@ typedef struct { __ex_mctx_struct } __ex_mctx_t; * following code which shows some pitfalls and contains many errors (assuming * a mallocex() function which throws an exception if malloc(3) fails): * - * \dontinclude ex_test.c + * \dontinclude ex.c * \skip BAD_EXAMPLE * \until end_of_bad_example * @@ -211,82 +248,96 @@ typedef struct { __ex_mctx_struct } __ex_mctx_t; * @{ */ +/** @brief different kind of errors */ typedef enum { - unknown_error=0, /**< unknown error */ + unknown_error = 0,/**< unknown error */ arg_error, /**< Invalid argument */ + bound_error, /**< Out of bounds argument */ mismatch_error, /**< The provided ID does not match */ not_found_error, /**< The searched element was not found */ - + system_error, /**< a syscall did fail */ network_error, /**< error while sending/receiving data */ timeout_error, /**< not quick enough, dude */ - thread_error /**< error while [un]locking */ + thread_error, /**< error while [un]locking */ + host_error, /**< host failed */ + tracing_error /**< error during the simulation tracing */ } xbt_errcat_t; -const char *xbt_errcat_name(xbt_errcat_t errcode); +XBT_PUBLIC(const char *) xbt_ex_catname(xbt_errcat_t cat); /** @brief Structure describing an exception */ typedef struct { - char *msg; /**< human readable message; to be freed */ - xbt_errcat_t category; /**< category like HTTP (what went wrong) */ - int value; /**< like errno (why did it went wrong) */ + char *msg; /**< human readable message */ + xbt_errcat_t category; + /**< category like HTTP (what went wrong) */ + int value; /**< like errno (why did it went wrong) */ /* throw point */ - char *host; /* NULL for localhost; hostname:port if remote */ - char *procname; - char *file; /**< to be freed only for remote exceptions */ - int line; - char *func; /**< to be freed only for remote exceptions */ + short int remote; + /**< whether it was raised remotely */ + char *host; /**< NULL locally thrown exceptions; full hostname if remote ones */ + /* FIXME: host should be hostname:port[#thread] */ + char *procname; + /**< Name of the process who thrown this */ + int pid; /**< PID of the process who thrown this */ + char *file; /**< Thrown point */ + int line; /**< Thrown point */ + char *func; /**< Thrown point */ /* Backtrace */ - void *bt[10]; - int used; + int used; + char **bt_strings; /* only filed on display (or before the network propagation) */ + void *bt[XBT_BACKTRACE_SIZE]; } xbt_ex_t; /* declare the context type (private) */ typedef struct { - __ex_mctx_t *ctx_mctx; /* permanent machine context of enclosing try/catch */ - int ctx_caught; /* temporary flag whether exception was caught */ - volatile xbt_ex_t ctx_ex; /* temporary exception storage */ + __ex_mctx_t *ctx_mctx; /* permanent machine context of enclosing try/catch */ + volatile int ctx_caught; /* temporary flag whether exception was caught */ + volatile xbt_ex_t ctx_ex; /* temporary exception storage */ } ex_ctx_t; /* the static and dynamic initializers for a context structure */ #define XBT_CTX_INITIALIZER \ { NULL, 0, { /* content */ NULL, unknown_error, 0, \ - /* throw point*/ NULL, NULL, NULL, 0, NULL,\ - /* backtrace */ {NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL},0 } } + /* throw point*/ 0,NULL, NULL,0, NULL, 0, NULL,\ + /* backtrace */ 0,NULL,{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL} } } #define XBT_CTX_INITIALIZE(ctx) \ do { \ - (ctx)->ctx_mctx = NULL; \ - (ctx)->ctx_caught = 0; \ - (ctx)->ctx_ex.msg = NULL; \ - (ctx)->ctx_ex.category = 0; \ - (ctx)->ctx_ex.value = 0; \ - (ctx)->ctx_ex.host = NULL; \ - (ctx)->ctx_ex.procname = NULL; \ - (ctx)->ctx_ex.file = NULL; \ - (ctx)->ctx_ex.line = 0; \ - (ctx)->ctx_ex.func = NULL; \ - (ctx)->ctx_ex.bt[0] = NULL; \ - (ctx)->ctx_ex.bt[1] = NULL; \ - (ctx)->ctx_ex.bt[2] = NULL; \ - (ctx)->ctx_ex.bt[3] = NULL; \ - (ctx)->ctx_ex.bt[4] = NULL; \ - (ctx)->ctx_ex.bt[5] = NULL; \ - (ctx)->ctx_ex.bt[6] = NULL; \ - (ctx)->ctx_ex.bt[7] = NULL; \ - (ctx)->ctx_ex.bt[8] = NULL; \ - (ctx)->ctx_ex.bt[9] = NULL; \ - (ctx)->ctx_ex.used = 0; \ + (ctx)->ctx_mctx = NULL; \ + (ctx)->ctx_caught = 0; \ + (ctx)->ctx_ex.msg = NULL; \ + (ctx)->ctx_ex.category = 0; \ + (ctx)->ctx_ex.value = 0; \ + (ctx)->ctx_ex.remote = 0; \ + (ctx)->ctx_ex.host = NULL; \ + (ctx)->ctx_ex.procname = NULL; \ + (ctx)->ctx_ex.pid = 0; \ + (ctx)->ctx_ex.file = NULL; \ + (ctx)->ctx_ex.line = 0; \ + (ctx)->ctx_ex.func = NULL; \ + (ctx)->ctx_ex.bt[0] = NULL; \ + (ctx)->ctx_ex.bt[1] = NULL; \ + (ctx)->ctx_ex.bt[2] = NULL; \ + (ctx)->ctx_ex.bt[3] = NULL; \ + (ctx)->ctx_ex.bt[4] = NULL; \ + (ctx)->ctx_ex.bt[5] = NULL; \ + (ctx)->ctx_ex.bt[6] = NULL; \ + (ctx)->ctx_ex.bt[7] = NULL; \ + (ctx)->ctx_ex.bt[8] = NULL; \ + (ctx)->ctx_ex.bt[9] = NULL; \ + (ctx)->ctx_ex.used = 0; \ + (ctx)->ctx_ex.bt_strings = NULL; \ } while (0) /* the exception context */ -typedef ex_ctx_t *(*ex_ctx_cb_t)(void); -extern ex_ctx_cb_t __xbt_ex_ctx; +typedef ex_ctx_t *(*ex_ctx_cb_t) (void); +XBT_PUBLIC_DATA(ex_ctx_cb_t) __xbt_ex_ctx; extern ex_ctx_t *__xbt_ex_ctx_default(void); /* the termination handler */ -typedef void (*ex_term_cb_t)(xbt_ex_t *); -extern ex_term_cb_t __xbt_ex_terminate; -extern void __xbt_ex_terminate_default(xbt_ex_t *e); +typedef void (*ex_term_cb_t) (xbt_ex_t *); +XBT_PUBLIC_DATA(ex_term_cb_t) __xbt_ex_terminate; +extern void __xbt_ex_terminate_default(xbt_ex_t * e); /** @brief Introduce a block where exception may be dealed with * @hideinitializer @@ -302,10 +353,10 @@ extern void __xbt_ex_terminate_default(xbt_ex_t *e); if (__ex_mctx_save(&__ex_mctx_me)) { \ if (1) -/** @brief optional(!) block for cleanup +/** @brief optional(!) block for cleanup * @hideinitializer */ -#define CLEANUP \ +#define TRY_CLEANUP \ else { \ } \ __xbt_ex_ctx_ptr->ctx_caught = 0; \ @@ -322,7 +373,7 @@ extern void __xbt_ex_terminate_default(xbt_ex_t *e); # ifdef __cplusplus # define XBT_EX_T_CPLUSPLUSCAST (xbt_ex_t&) # else -# define XBT_EX_T_CPLUSPLUSCAST +# define XBT_EX_T_CPLUSPLUSCAST # endif #endif @@ -343,10 +394,18 @@ extern void __xbt_ex_terminate_default(xbt_ex_t *e); __xbt_ex_ctx_ptr->ctx_mctx = __ex_mctx_en; \ } \ if ( !(__xbt_ex_ctx()->ctx_caught) \ - || ((e) = XBT_EX_T_CPLUSPLUSCAST __xbt_ex_ctx()->ctx_ex, 0)) { \ + || ((e) = XBT_EX_T_CPLUSPLUSCAST __xbt_ex_ctx()->ctx_ex, MAYDAY_CATCH(e) 0)) { \ } \ else +#define DO_THROW(e) \ + /* deal with the exception */ \ + if (__xbt_ex_ctx()->ctx_mctx == NULL) \ + __xbt_ex_terminate((xbt_ex_t *)&(e)); /* not catched */\ + else \ + __ex_mctx_restore(__xbt_ex_ctx()->ctx_mctx); /* catched somewhere */ \ + abort() /* nope, stupid GCC, we won't survive a THROW (this won't be reached) */ + /** @brief Helper macro for THROWS0-6 * @hideinitializer * @@ -356,9 +415,9 @@ extern void __xbt_ex_terminate_default(xbt_ex_t *e); * * If called from within a TRY/CATCH construct, this exception * is copied into the CATCH relevant variable program control flow - * is derouted to the CATCH (after the optional sg_cleanup). + * is derouted to the CATCH (after the optional sg_cleanup). * - * If no TRY/CATCH construct embeeds this call, the program calls + * If no TRY/CATCH construct embeds this call, the program calls * abort(3). * * The THROW can be performed everywhere, including inside TRY, @@ -366,24 +425,24 @@ extern void __xbt_ex_terminate_default(xbt_ex_t *e); */ #define _THROW(c,v,m) \ - do { /* change this sequence into one block */ \ - /* build the exception */ \ - __xbt_ex_ctx()->ctx_ex.msg = (m); \ - __xbt_ex_ctx()->ctx_ex.category = (c); \ - __xbt_ex_ctx()->ctx_ex.value = (v); \ - __xbt_ex_ctx()->ctx_ex.host = (char*)NULL; \ - __xbt_ex_ctx()->ctx_ex.procname = strdup(xbt_procname()); \ - __xbt_ex_ctx()->ctx_ex.file = (char*)__FILE__; \ - __xbt_ex_ctx()->ctx_ex.line = __LINE__; \ - __xbt_ex_ctx()->ctx_ex.func = (char*)_XBT_FUNCTION; \ - __xbt_ex_ctx()->ctx_ex.used = backtrace((void**)__xbt_ex_ctx()->ctx_ex.bt,10);\ - /* deal with the exception */ \ - if (__xbt_ex_ctx()->ctx_mctx == NULL) \ - __xbt_ex_terminate((xbt_ex_t *)&(__xbt_ex_ctx()->ctx_ex)); /* not catched */\ - else \ - __ex_mctx_restore(__xbt_ex_ctx()->ctx_mctx); /* catched somewhere */ \ - abort();/* nope, stupid GCC, we won't survive a THROW (this won't be reached) */ \ + do { /* change this sequence into one block */ \ + ex_ctx_t *_throw_ctx = __xbt_ex_ctx(); \ + /* build the exception */ \ + _throw_ctx->ctx_ex.msg = (m); \ + _throw_ctx->ctx_ex.category = (xbt_errcat_t)(c); \ + _throw_ctx->ctx_ex.value = (v); \ + _throw_ctx->ctx_ex.remote = 0; \ + _throw_ctx->ctx_ex.host = (char*)NULL; \ + _throw_ctx->ctx_ex.procname = (char*)xbt_procname(); \ + _throw_ctx->ctx_ex.pid = (*xbt_getpid)(); \ + _throw_ctx->ctx_ex.file = (char*)__FILE__; \ + _throw_ctx->ctx_ex.line = __LINE__; \ + _throw_ctx->ctx_ex.func = (char*)_XBT_FUNCTION; \ + _throw_ctx->ctx_ex.bt_strings = NULL; \ + xbt_backtrace_current( (xbt_ex_t *) &(_throw_ctx->ctx_ex) ); \ + DO_THROW(_throw_ctx->ctx_ex); \ } while (0) +/* __xbt_ex_ctx()->ctx_ex.used = backtrace((void**)__xbt_ex_ctx()->ctx_ex.bt,XBT_BACKTRACE_SIZE); */ /** @brief Builds and throws an exception with a string taking no arguments @hideinitializer */ @@ -406,10 +465,18 @@ extern void __xbt_ex_terminate_default(xbt_ex_t *e); /** @brief Builds and throws an exception with a string taking six arguments @hideinitializer */ #define THROW6(c,v,m,a1,a2,a3,a4,a5,a6) _THROW(c,v,bprintf(m,a1,a2,a3,a4,a5,a6)) +/** @brief Builds and throws an exception with a string taking seven arguments + @hideinitializer */ +#define THROW7(c,v,m,a1,a2,a3,a4,a5,a6,a7) _THROW(c,v,bprintf(m,a1,a2,a3,a4,a5,a6,a7)) #define THROW_IMPOSSIBLE THROW0(unknown_error,0,"The Impossible Did Happen (yet again)") -#define DIE_IMPOSSIBLE xbt_assert0(0,"The Impossible Did Happen (yet again)") -#define THROW_UNIMPLEMENTED THROW1(unknown_error,0,"Function %s unimplemented",__FUNCTION__) +#define THROW_UNIMPLEMENTED THROW1(unknown_error,0,"Function %s unimplemented",_XBT_FUNCTION) + +#ifndef NDEBUG +# define DIE_IMPOSSIBLE xbt_assert0(0,"The Impossible Did Happen (yet again)") +#else +# define DIE_IMPOSSIBLE exit(1); +#endif /** @brief re-throwing of an already caught exception (ie, pass it to the upper catch block) * @hideinitializer @@ -455,18 +522,23 @@ extern void __xbt_ex_terminate_default(xbt_ex_t *e); /** @brief like THROW4, but adding some details to the message of an existing exception * @hideinitializer */ -#define RETHROW4(msg,a,b,c,d) _XBT_PRE_RETHROW msg,a,b,c, _XBT_POST_RETHROW +#define RETHROW4(msg,a,b,c,d) _XBT_PRE_RETHROW msg,a,b,c,d, _XBT_POST_RETHROW /** @brief like THROW5, but adding some details to the message of an existing exception * @hideinitializer */ -#define RETHROW5(msg,a,b,c,d,e) _XBT_PRE_RETHROW msg,a,b,c,d,e _XBT_POST_RETHROW +#define RETHROW5(msg,a,b,c,d,e) _XBT_PRE_RETHROW msg,a,b,c,d,e, _XBT_POST_RETHROW /** @brief Exception destructor */ -void xbt_ex_free(xbt_ex_t e); -const char * xbt_ex_catname(xbt_errcat_t cat); +XBT_PUBLIC(void) xbt_ex_free(xbt_ex_t e); + +/** @brief Shows a backtrace of the current location */ +XBT_PUBLIC(void) xbt_backtrace_display_current(void); +/** @brief Captures a backtrace for further use */ +XBT_PUBLIC(void) xbt_backtrace_current(xbt_ex_t * e); +/** @brief Display a previously captured backtrace */ +XBT_PUBLIC(void) xbt_backtrace_display(xbt_ex_t * e); -void xbt_ex_display(xbt_ex_t *e); +SG_END_DECL() /** @} */ -#endif /* __XBT_EX_H__ */ - +#endif /* __XBT_EX_H__ */