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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Current File : //lib64/perl5/CORE/perldtrace.h

/* Generated by the Systemtap dtrace wrapper */


#define _SDT_HAS_SEMAPHORES 1


#define STAP_HAS_SEMAPHORES 1 /* deprecated */


#include <sys/sdt.h>

/* PERL_SUB_ENTRY ( const char *, const char *, int, const char * ) */
#if defined STAP_SDT_V1
#define PERL_SUB_ENTRY_ENABLED() __builtin_expect (sub__entry_semaphore, 0)
#define perl_sub__entry_semaphore sub__entry_semaphore
#else
#define PERL_SUB_ENTRY_ENABLED() __builtin_expect (perl_sub__entry_semaphore, 0)
#endif
__extension__ extern unsigned short perl_sub__entry_semaphore __attribute__ ((unused)) __attribute__ ((section (".probes")));
#define PERL_SUB_ENTRY(arg1, arg2, arg3, arg4) \
DTRACE_PROBE4 (perl, sub__entry, arg1, arg2, arg3, arg4)

/* PERL_SUB_RETURN ( const char *, const char *, int, const char * ) */
#if defined STAP_SDT_V1
#define PERL_SUB_RETURN_ENABLED() __builtin_expect (sub__return_semaphore, 0)
#define perl_sub__return_semaphore sub__return_semaphore
#else
#define PERL_SUB_RETURN_ENABLED() __builtin_expect (perl_sub__return_semaphore, 0)
#endif
__extension__ extern unsigned short perl_sub__return_semaphore __attribute__ ((unused)) __attribute__ ((section (".probes")));
#define PERL_SUB_RETURN(arg1, arg2, arg3, arg4) \
DTRACE_PROBE4 (perl, sub__return, arg1, arg2, arg3, arg4)

/* PERL_PHASE_CHANGE ( const char *, const char * ) */
#if defined STAP_SDT_V1
#define PERL_PHASE_CHANGE_ENABLED() __builtin_expect (phase__change_semaphore, 0)
#define perl_phase__change_semaphore phase__change_semaphore
#else
#define PERL_PHASE_CHANGE_ENABLED() __builtin_expect (perl_phase__change_semaphore, 0)
#endif
__extension__ extern unsigned short perl_phase__change_semaphore __attribute__ ((unused)) __attribute__ ((section (".probes")));
#define PERL_PHASE_CHANGE(arg1, arg2) \
DTRACE_PROBE2 (perl, phase__change, arg1, arg2)

/* PERL_OP_ENTRY ( const char * ) */
#if defined STAP_SDT_V1
#define PERL_OP_ENTRY_ENABLED() __builtin_expect (op__entry_semaphore, 0)
#define perl_op__entry_semaphore op__entry_semaphore
#else
#define PERL_OP_ENTRY_ENABLED() __builtin_expect (perl_op__entry_semaphore, 0)
#endif
__extension__ extern unsigned short perl_op__entry_semaphore __attribute__ ((unused)) __attribute__ ((section (".probes")));
#define PERL_OP_ENTRY(arg1) \
DTRACE_PROBE1 (perl, op__entry, arg1)

/* PERL_LOADING_FILE ( const char * ) */
#if defined STAP_SDT_V1
#define PERL_LOADING_FILE_ENABLED() __builtin_expect (loading__file_semaphore, 0)
#define perl_loading__file_semaphore loading__file_semaphore
#else
#define PERL_LOADING_FILE_ENABLED() __builtin_expect (perl_loading__file_semaphore, 0)
#endif
__extension__ extern unsigned short perl_loading__file_semaphore __attribute__ ((unused)) __attribute__ ((section (".probes")));
#define PERL_LOADING_FILE(arg1) \
DTRACE_PROBE1 (perl, loading__file, arg1)

/* PERL_LOADED_FILE ( const char * ) */
#if defined STAP_SDT_V1
#define PERL_LOADED_FILE_ENABLED() __builtin_expect (loaded__file_semaphore, 0)
#define perl_loaded__file_semaphore loaded__file_semaphore
#else
#define PERL_LOADED_FILE_ENABLED() __builtin_expect (perl_loaded__file_semaphore, 0)
#endif
__extension__ extern unsigned short perl_loaded__file_semaphore __attribute__ ((unused)) __attribute__ ((section (".probes")));
#define PERL_LOADED_FILE(arg1) \
DTRACE_PROBE1 (perl, loaded__file, arg1)

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