diff options
| -rw-r--r-- | Changes | 2 | ||||
| -rw-r--r-- | ev.c | 15 | ||||
| -rw-r--r-- | ev.pod | 13 |
3 files changed, 29 insertions, 1 deletions
@@ -2,11 +2,11 @@ Revision history for libev, a high-performance and full-featured event loop. TODO: ev_loop_wakeup -TODO: EV_NO_THREADS/NO_SMP and/or EV_USE_PTHREADS or so. also document. TODO: EV_STANDALONE == NO_HASSEL (do not use clock_gettime in ev_standalone) 4.11 - INCOMPATIBLE CHANGE: ev_timer_again now clears the pending status, as was documented already, but not implemented in the repeating case. + - new compiletime symbols: EV_NO_SMP and EV_NO_THREADS. - fix a race where the workaround against the epoll fork bugs caused signals to not be handled anymore. - correct backend_fudge for most backends, and implement a windows @@ -185,6 +185,17 @@ # include "ev.h" #endif +#if EV_NO_THREADS +# undef EV_NO_SMP +# define EV_NO_SMP 1 +# undef ECB_NO_THREADS +# define ECB_NO_THREADS 1 +#endif +#if EV_NO_SMP +# undef EV_NO_SMP +# define ECB_NO_SMP 1 +#endif + #ifndef _WIN32 # include <sys/time.h> # include <sys/wait.h> @@ -536,6 +547,10 @@ struct signalfd_siginfo /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ +#if ECB_NO_THREADS +# define ECB_NO_SMP 1 +#endif + #if ECB_NO_THREADS || ECB_NO_SMP #define ECB_MEMORY_FENCE do { } while (0) #endif @@ -4506,6 +4506,19 @@ interface to speed up C<ev_stat> watchers. Its actual availability will be detected at runtime. If undefined, it will be enabled if the headers indicate GNU/Linux + Glibc 2.4 or newer, otherwise disabled. +=item EV_NO_SMP + +If defined to be C<1>, libev will assume that memory is always coherent +between threads, that is, threads can be used, but threads never run on +different cpus (or different cpu cores). This reduces dependencies +and makes libev faster. + +=item EV_NO_THREADS + +If defined to be C<1>, libev will assume that it will never be called +from different threads, which is a stronger assumption than C<EV_NO_SMP>, +above. This reduces dependencies and makes libev faster. + =item EV_ATOMIC_T Libev requires an integer type (suitable for storing C<0> or C<1>) whose |