sched.h 7.1 KB

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  1. /* Definitions of constants and data structure for POSIX 1003.1b-1993
  2. scheduling interface.
  3. Copyright (C) 1996-1999,2001-2003,2005,2006,2007,2008
  4. Free Software Foundation, Inc.
  5. This file is part of the GNU C Library.
  6. The GNU C Library is free software; you can redistribute it and/or
  7. modify it under the terms of the GNU Lesser General Public
  8. License as published by the Free Software Foundation; either
  9. version 2.1 of the License, or (at your option) any later version.
  10. The GNU C Library is distributed in the hope that it will be useful,
  11. but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13. Lesser General Public License for more details.
  14. You should have received a copy of the GNU Lesser General Public
  15. License along with the GNU C Library; if not, see
  16. <http://www.gnu.org/licenses/>. */
  17. #ifndef __need_schedparam
  18. #ifndef _SCHED_H
  19. # error "Never include <bits/sched.h> directly; use <sched.h> instead."
  20. #endif
  21. /* Scheduling algorithms. */
  22. #define SCHED_OTHER 0
  23. #define SCHED_FIFO 1
  24. #define SCHED_RR 2
  25. #ifdef __USE_GNU
  26. # define SCHED_BATCH 3
  27. #endif
  28. #ifdef __USE_MISC
  29. /* Cloning flags. */
  30. # define CSIGNAL 0x000000ff /* Signal mask to be sent at exit. */
  31. # define CLONE_VM 0x00000100 /* Set if VM shared between processes. */
  32. # define CLONE_FS 0x00000200 /* Set if fs info shared between processes. */
  33. # define CLONE_FILES 0x00000400 /* Set if open files shared between processes. */
  34. # define CLONE_SIGHAND 0x00000800 /* Set if signal handlers shared. */
  35. # define CLONE_PTRACE 0x00002000 /* Set if tracing continues on the child. */
  36. # define CLONE_VFORK 0x00004000 /* Set if the parent wants the child to
  37. wake it up on mm_release. */
  38. # define CLONE_PARENT 0x00008000 /* Set if we want to have the same
  39. parent as the cloner. */
  40. # define CLONE_THREAD 0x00010000 /* Set to add to same thread group. */
  41. # define CLONE_NEWNS 0x00020000 /* Set to create new namespace. */
  42. # define CLONE_SYSVSEM 0x00040000 /* Set to shared SVID SEM_UNDO semantics. */
  43. # define CLONE_SETTLS 0x00080000 /* Set TLS info. */
  44. # define CLONE_PARENT_SETTID 0x00100000 /* Store TID in userlevel buffer
  45. before MM copy. */
  46. # define CLONE_CHILD_CLEARTID 0x00200000 /* Register exit futex and memory
  47. location to clear. */
  48. # define CLONE_DETACHED 0x00400000 /* Create clone detached. */
  49. # define CLONE_UNTRACED 0x00800000 /* Set if the tracing process can't
  50. force CLONE_PTRACE on this clone. */
  51. # define CLONE_CHILD_SETTID 0x01000000 /* Store TID in userlevel buffer in
  52. the child. */
  53. # define CLONE_STOPPED 0x02000000 /* Start in stopped state. */
  54. # define CLONE_NEWUTS 0x04000000 /* New utsname group. */
  55. # define CLONE_NEWIPC 0x08000000 /* New ipcs. */
  56. # define CLONE_NEWUSER 0x10000000 /* New user namespace. */
  57. # define CLONE_NEWPID 0x20000000 /* New pid namespace. */
  58. # define CLONE_NEWNET 0x40000000 /* New network namespace. */
  59. # define CLONE_IO 0x80000000 /* Clone I/O context. */
  60. #endif
  61. /* The official definition. */
  62. struct sched_param
  63. {
  64. int __sched_priority;
  65. };
  66. __BEGIN_DECLS
  67. #ifdef __USE_MISC
  68. /* Clone current process. */
  69. extern int clone (int (*__fn) (void *__arg), void *__child_stack,
  70. int __flags, void *__arg, ...) __THROW;
  71. /* Unshare the specified resources. */
  72. extern int unshare (int __flags) __THROW;
  73. /* Get index of currently used CPU. */
  74. extern int sched_getcpu (void) __THROW;
  75. #endif
  76. __END_DECLS
  77. #endif /* need schedparam */
  78. #if !defined __defined_schedparam \
  79. && (defined __need_schedparam || defined _SCHED_H)
  80. # define __defined_schedparam 1
  81. /* Data structure to describe a process' schedulability. */
  82. struct __sched_param
  83. {
  84. int __sched_priority;
  85. };
  86. # undef __need_schedparam
  87. #endif
  88. #if defined _SCHED_H && !defined __cpu_set_t_defined
  89. # define __cpu_set_t_defined
  90. /* Size definition for CPU sets. */
  91. # define __CPU_SETSIZE 1024
  92. # define __NCPUBITS (8 * sizeof (__cpu_mask))
  93. # include <stdlib.h>
  94. /* Type for array elements in 'cpu_set_t'. */
  95. typedef unsigned long int __cpu_mask;
  96. /* Basic access functions. */
  97. # define __CPUELT(cpu) ((cpu) / __NCPUBITS)
  98. # define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS))
  99. /* Data structure to describe CPU mask. */
  100. typedef struct
  101. {
  102. __cpu_mask __bits[__CPU_SETSIZE / __NCPUBITS];
  103. } cpu_set_t;
  104. /* Access functions for CPU masks. */
  105. # define __CPU_ZERO_S(setsize, cpusetp) \
  106. do { \
  107. size_t __i; \
  108. size_t __imax = (setsize) / sizeof (__cpu_mask); \
  109. __cpu_mask *__bits = (cpusetp)->__bits; \
  110. for (__i = 0; __i < __imax; ++__i) \
  111. __bits[__i] = 0; \
  112. } while (0)
  113. # define __CPU_SET_S(cpu, setsize, cpusetp) \
  114. (__extension__ \
  115. ({ size_t __cpu = (cpu); \
  116. __cpu < 8 * (setsize) \
  117. ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
  118. |= __CPUMASK (__cpu)) \
  119. : 0; }))
  120. # define __CPU_CLR_S(cpu, setsize, cpusetp) \
  121. (__extension__ \
  122. ({ size_t __cpu = (cpu); \
  123. __cpu < 8 * (setsize) \
  124. ? (((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
  125. &= ~__CPUMASK (__cpu)) \
  126. : 0; }))
  127. # define __CPU_ISSET_S(cpu, setsize, cpusetp) \
  128. (__extension__ \
  129. ({ size_t __cpu = (cpu); \
  130. __cpu < 8 * (setsize) \
  131. ? ((((__cpu_mask *) ((cpusetp)->__bits))[__CPUELT (__cpu)] \
  132. & __CPUMASK (__cpu))) != 0 \
  133. : 0; }))
  134. # define __CPU_COUNT_S(setsize, cpusetp) \
  135. __sched_cpucount (setsize, cpusetp)
  136. # define __CPU_EQUAL_S(setsize, cpusetp1, cpusetp2) \
  137. (__extension__ \
  138. ({ __cpu_mask *__arr1 = (cpusetp1)->__bits; \
  139. __cpu_mask *__arr2 = (cpusetp2)->__bits; \
  140. size_t __imax = (setsize) / sizeof (__cpu_mask); \
  141. size_t __i; \
  142. for (__i = 0; __i < __imax; ++__i) \
  143. if (__arr1[__i] != __arr2[__i]) \
  144. break; \
  145. __i == __imax; }))
  146. # define __CPU_OP_S(setsize, destset, srcset1, srcset2, op) \
  147. (__extension__ \
  148. ({ cpu_set_t *__dest = (destset); \
  149. __cpu_mask *__arr1 = (srcset1)->__bits; \
  150. __cpu_mask *__arr2 = (srcset2)->__bits; \
  151. size_t __imax = (setsize) / sizeof (__cpu_mask); \
  152. size_t __i; \
  153. for (__i = 0; __i < __imax; ++__i) \
  154. ((__cpu_mask *) __dest->__bits)[__i] = __arr1[__i] op __arr2[__i]; \
  155. __dest; }))
  156. # define __CPU_ALLOC_SIZE(count) \
  157. ((((count) + __NCPUBITS - 1) / __NCPUBITS) * sizeof (__cpu_mask))
  158. # define __CPU_ALLOC(count) __sched_cpualloc (count)
  159. # define __CPU_FREE(cpuset) __sched_cpufree (cpuset)
  160. __BEGIN_DECLS
  161. extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
  162. __THROW;
  163. #if 0 /* in uClibc we use macros */
  164. extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
  165. extern void __sched_cpufree (cpu_set_t *__set) __THROW;
  166. #else
  167. # define __sched_cpualloc(cnt) ((cpu_set_t *)malloc(__CPU_ALLOC_SIZE(cnt)))
  168. # define __sched_cpufree(__set) free(__set)
  169. #endif
  170. __END_DECLS
  171. #endif