LXR linux/include/linux/threads.h

   1#ifndef _LINUX_THREADS_H
   2#define _LINUX_THREADS_H
   3
   4
   5/*
   6 * The default limit for the nr of threads is now in
   7 * /proc/sys/kernel/threads-max.
   8 */
   9
  10/*
  11 * Maximum supported processors that can run under SMP.  This value is
  12 * set via configure setting.  The maximum is equal to the size of the
  13 * bitmasks used on that platform, i.e. 32 or 64.  Setting this smaller
  14 * saves quite a bit of memory.
  15 */
  16#ifdef CONFIG_SMP
  17#define NR_CPUS         CONFIG_NR_CPUS
  18#else
  19#define NR_CPUS         1
  20#endif
  21
  22#define MIN_THREADS_LEFT_FOR_ROOT 4
  23
  24/*
  25 * This controls the default maximum pid allocated to a process
  26 */
  27#define PID_MAX_DEFAULT (CONFIG_BASE_SMALL ? 0x1000 : 0x8000)
  28
  29/*
  30 * A maximum of 4 million PIDs should be enough for a while.
  31 * [NOTE: PID/TIDs are limited to 2^29 ~= 500+ million, see futex.h.]
  32 */
  33#define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \
  34        (sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))
  35
  36#endif
  37