P99_SPIN_EXCLUDE

P99_SPIN_EXCLUDE #define P99_SPIN_EXCLUDE (   FLAGP )    P00_SPIN_EXCLUDE(FLAGP, P99_UNIQ(flg)) Protect the following block or statement as a critical section of the program by using FLAGP as a spinlock. Parameters FLAGP is an expression that evaluates to a pointer to ::atomic_flag. The flag is used as a spinlock, so this is an active wait. Remarks FLAGP is only evaluated once at the beginning, so it would be safe to change it in the depending block or statement. Warning Such a section should only contain a handful of statements. Such a section should not contain preliminary exits such as goto, break, return, longjmp, or P99_UNWIND etc. Such a critical section is only protected against threads that try to enter this same critical section. Threads may well simultaneously be in different critical sections. See also P99_MUTUAL_EXCLUDE that is more suited for larger sections. Definition at line 90 of file p99_atomic_flag.h.