2 * lwpint.h -- lwp internal structures
4 * Copyright (C) 1991-3 Stephen Crane.
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the Free
18 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 * author: Stephen Crane, (jsc@doc.ic.ac.uk), Department of Computing,
21 * Imperial College of Science, Technology and Medicine, 180 Queen's
22 * Gate, London SW7 2BZ, England.
27 /* `liveness' counter: check signals every `n' visits to the scheduler */
28 /* note: the lower this value, the more responsive the system but the */
29 /* more inefficient the context switch time */
32 /* process control block. do *not* change the position of context */
35 ucontext_t context; /* context structure */
37 jmp_buf context; /* processor context area */
38 #endif /* !UCONTEXT */
39 void *sbtm; /* bottom of stack attached to it */
40 int size; /* size of stack */
41 void (*entry)(void *); /* entry point */
42 int dead; /* whether the process can be rescheduled */
43 int pri; /* which scheduling queue we're on */
44 long runtime; /* time at which process is restarted */
45 int fd; /* fd we're blocking on */
46 int argc; /* initial arguments */
48 void *ud; /* user data */
49 void *lowmark; /* start of low buffer around stack */
50 void *himark; /* start of upper buffer around stack */
51 char *name; /* process name and description */
71 void lwpInitContext(struct lwpProc *, stack_t *);
72 #define lwpSave(x) getcontext(&(x))
73 #define lwpRestore(x) setcontext(&(x))
75 #if defined(hpux) && !defined(hpc)
76 void lwpInitContext(volatile struct lwpProc * volatile, void *);
78 void lwpInitContext(struct lwpProc *, void *);
82 #define lwpRestore(x) longjmp(x, 1)
83 #elif defined(hpux) || defined(AIX32) || defined(ALPHA)
85 void lwpRestore(jmp_buf);
87 #define lwpSave(x) _setjmp(x)
88 #define lwpRestore(x) _longjmp(x, 1)
90 #define lwpSave(x) setjmp(x)
91 #define lwpRestore(x) longjmp(x, 1)
93 #endif /* !UCONTEXT */
96 /* AIX needs 12 extra bytes above the stack; we add it here */
97 #define LWP_EXTRASTACK 3*sizeof(long)
99 #define LWP_EXTRASTACK 0
102 #define LWP_REDZONE 1024 /* make this a multiple of 1024 */
104 /* XXX Note that this assumes sizeof(long) == 4 */
105 #define LWP_CHECKMARK 0x5a5a5a5aL
110 #define STKALIGN sizeof(double)
113 /* internal routines */
114 void lwpAddTail(struct lwpQueue *, struct lwpProc *);
115 struct lwpProc *lwpGetFirst(struct lwpQueue *);
116 void lwpReady(struct lwpProc *);
117 void lwpReschedule(void);
118 void lwpEntryPoint(void);
119 void lwpInitSelect(struct lwpProc * self);
120 void lwpDestroy(struct lwpProc * proc);