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Removed NR_TASKS from macros manipulating endpoint_t

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- the magic numbers ANY, NONE and SELF are kept for the compatibility with the
  current userspace. It is OK as long as NR_PROCS is greater so they don't
  colide with other endpoints

- the 32 bit endpoint_t value is split in half, lower 16 bits for process slot
  number and upper half for generation number

- transition to a structured endpoint_t in the future possible
This commit is contained in:
Tomas Hruby 2009-09-22 21:45:26 +00:00
parent b900311656
commit c0a1fd1292
2 changed files with 11 additions and 7 deletions
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6
include/minix/com.h
View File

@ -9,8 +9,10 @@
#define ANY 0x7ace /* used to indicate 'any process' */
#define NONE 0x6ace /* used to indicate 'no process at all' */
#define SELF 0x8ace /* used to indicate 'own process' */
#define _MAX_MAGIC_PROC (SELF) /* used by <minix/endpoint.h>
to determine generation size */
/* check if the magic process numbers are valid process table slot numbers */
#if (ANY < NR_PROCS)
#error "Magic process number in the process table range"
#endif
/*===========================================================================*
* Process numbers of processes in the system image *

12
include/minix/endpoint.h
View File

@ -15,12 +15,14 @@
* the generation size is big enough to start the next generation
* above the highest magic number.
*/
#define _ENDPOINT_GENERATION_SIZE (NR_TASKS+_MAX_MAGIC_PROC+1)
#define _ENDPOINT_MAX_GENERATION (INT_MAX/_ENDPOINT_GENERATION_SIZE-1)
#define _ENDPOINT_GENERATION_BITS 16
#define _ENDPOINT_PNUM_BITS 16
#define _ENDPOINT_MAX_GENERATION ((1 << _ENDPOINT_GENERATION_BITS)-1)
#define _ENDPOINT_MAX_PNUM ((1 << _ENDPOINT_PNUM_BITS) - 1)
/* Generation + Process slot number <-> endpoint. */
#define _ENDPOINT(g, p) ((g) * _ENDPOINT_GENERATION_SIZE + (p))
#define _ENDPOINT_G(e) (((e)+NR_TASKS) / _ENDPOINT_GENERATION_SIZE)
#define _ENDPOINT_P(e) ((((e)+NR_TASKS) % _ENDPOINT_GENERATION_SIZE) - NR_TASKS)
#define _ENDPOINT(g, p) ((endpoint_t)(((g) << _ENDPOINT_PNUM_BITS) | (p)))
#define _ENDPOINT_G(e) ((u16_t)((e) >> _ENDPOINT_PNUM_BITS))
#define _ENDPOINT_P(e) ((i16_t)((e) & _ENDPOINT_MAX_PNUM))
#endif