diff options
| -rw-r--r-- | toys/other/taskset.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/toys/other/taskset.c b/toys/other/taskset.c index 2b067d4a..28519231 100644 --- a/toys/other/taskset.c +++ b/toys/other/taskset.c @@ -3,6 +3,17 @@ * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com> USE_TASKSET(NEWTOY(taskset, "<1^pa", TOYFLAG_BIN|TOYFLAG_STAYROOT)) +USE_NPROC(NEWTOY(nproc, "(all)", TOYFLAG_USR|TOYFLAG_BIN)) + +config NPROC + bool "nproc" + default y + help + usage: nproc [--all] + + Print number of processors. + + --all Show all processors, not just ones this task can run on. config TASKSET bool "taskset" @@ -29,6 +40,10 @@ config TASKSET #define sched_getaffinity(pid, size, cpuset) \ syscall(__NR_sched_getaffinity, (pid_t)pid, (size_t)size, (void *)cpuset) +GLOBALS( + int nproc; +) + // mask is an array of long, which makes the layout a bit weird on big // endian systems but as long as it's consistent... @@ -104,3 +119,30 @@ void taskset_main(void) } else do_taskset(pid, 0); } } + +int do_nproc(struct dirtree *new) +{ + if (!new->parent) return DIRTREE_RECURSE; + if (!strncmp(new->name, "cpu", 3) && isdigit(new->name[3])) TT.nproc++; + + return 0; +} + +void nproc_main(void) +{ + int i, j; + + // This can only detect 32768 processors. Call getaffinity and count bits. + if (!toys.optflags && -1!=sched_getaffinity(getpid(), 4096, toybuf)) { + for (i = 0; i<4096; i++) + if (toybuf[i]) + for (j=0; j<8; j++) + if (toybuf[i]&(1<<j)) + TT.nproc++; + } + + // If getaffinity failed or --all, count cpu entries in proc + if (!TT.nproc) dirtree_read("/sys/devices/system/cpu", do_nproc); + + xprintf("%d\n", TT.nproc); +} |