Hi, In the below code fragment, how does this escape an infinite loop (line 116 down)? >From linux-2.6.16/include/asm-i386/semaphore.h ( http://lxr.linux.no/ident?v=2.6.10;i=down ) 105 static inline void down(struct semaphore * sem) 106 { might_sleep(); __asm__ __volatile__( "# atomic down operation\n\t" LOCK "decl %0\n\t" /* --sem->count */ // locked and decremented. "js 2f\n" // if sign is set jump to 2: "1:\n" LOCK_SECTION_START("") // starts a new section in elf, what does this mean? "2:\tlea %0,%%eax\n\t" // loads &sem (==&sem->count) into eax. "call __down_failed\n\t" // this eventually returns when sem is acquired 116 "jmp 1b\n" // goes back to 1: ... how would this function ever return? 117 LOCK_SECTION_END :"=m" (sem->count) : :"memory","ax"); } Any pointers/ideas? I checked the man pages of as. I did not quite follow the .previous...etc directives. Regards, Om. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
