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authorMichael I. Bushnell <mib@gnu.org>1994-01-13 20:53:13 +0000
committerMichael I. Bushnell <mib@gnu.org>1994-01-13 20:53:13 +0000
commitc1f5bf6d4849a1fe6b5c81e1900f8b0696288571 (patch)
tree8ff9389036f502c524024a59a7bcb9389e01f2c2 /libpager
parenteb5725ffc76078a95d15c44ec2e228e8baff6ffa (diff)
Initial revision
Diffstat (limited to 'libpager')
-rw-r--r--libpager/inhibit-term.c34
-rw-r--r--libpager/mark-error.c96
-rw-r--r--libpager/object-terminate.c94
-rw-r--r--libpager/pagemap.c40
-rw-r--r--libpager/seqnos.c41
-rw-r--r--libpager/stubs.c66
6 files changed, 371 insertions, 0 deletions
diff --git a/libpager/inhibit-term.c b/libpager/inhibit-term.c
new file mode 100644
index 00000000..9eb5f47c
--- /dev/null
+++ b/libpager/inhibit-term.c
@@ -0,0 +1,34 @@
+/* Locks to inhibit termination races for pager library
+ Copyright (C) 1994 Free Software Foundation
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2, or (at
+ your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+/* Prevent this memory object from being terminated. */
+/* Must be called with interlock held. */
+void
+_pager_block_termination (struct pager *p)
+{
+ p->noterm++;
+}
+
+/* Allow termination again. */
+/* Must be called with interlock held. */
+void
+_pagerallow_termination (struct pager *p)
+{
+ if (!--p->noterm && p->termwaiting)
+ condition_broadcast (&p->wakeup);
+}
diff --git a/libpager/mark-error.c b/libpager/mark-error.c
new file mode 100644
index 00000000..1463035c
--- /dev/null
+++ b/libpager/mark-error.c
@@ -0,0 +1,96 @@
+/* Recording errors for pager library
+ Copyright (C) 1994 Free Software Foundation
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2, or (at
+ your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+/* Some error has happened indicating that the page cannot be written.
+ (Usually this is ENOSPC or EDQOUT.) On the next pagein which
+ requests write access, return the error to the kernel. (This is
+ screwy because of the rules associated with m_o_lock_request.) */
+void
+mark_next_request_error(struct pager *p,
+ int offset,
+ int length,
+ error_t error)
+{
+ int page_error;
+ char *p;
+
+ offset /= __vm_page_size;
+ length /= __vm_page_size;
+
+ switch (error)
+ {
+ case 0:
+ page_error = PAGE_NOERR;
+ break;
+ case ENOSPC:
+ page_error = PAGE_ENOSPC;
+ break;
+ case EIO:
+ page_error = PAGE_EIO;
+ break;
+ case EDQUOT:
+ page_error = PAGE_EDQUOT;
+ break;
+ default:
+ panic ("mark_object_error");
+ break;
+ }
+
+ for (p = p->pagemap; p < p->pagemap + length; p++)
+ *p = SET_PM_NEXTERROR (*p, page_error);
+}
+
+/* We are returning a pager error to the kernel. Write down
+ in the pager what that error was so that the exception handling
+ routines can find out. (This is only necessary because the
+ XP interface is not completely implemented in the kernel.) */
+void
+mark_object_error(struct pager *p,
+ int offset,
+ int length,
+ error_t error)
+{
+ int page_error = 0;
+ char *p;
+
+ offset /= __vm_page_size;
+ length /= __vm_page_size;
+
+ switch (error)
+ {
+ case 0:
+ page_error = PAGE_NOERR;
+ break;
+ case ENOSPC:
+ page_error = PAGE_ENOSPC;
+ break;
+ case EIO:
+ page_error = PAGE_EIO;
+ break;
+ case EDQUOT:
+ page_error = PAGE_EDQUOT;
+ break;
+ default:
+ panic ("mark_object_error");
+ break;
+ }
+
+ for (p = p->pagemap; p < p->pagemap + length; p++)
+ *p = SET_PM_ERROR (*p, page_error);
+}
+
diff --git a/libpager/object-terminate.c b/libpager/object-terminate.c
new file mode 100644
index 00000000..251fc6db
--- /dev/null
+++ b/libpager/object-terminate.c
@@ -0,0 +1,94 @@
+/* Implementation of memory_object_terminate for pager library
+ Copyright (C) 1994 Free Software Foundation
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2, or (at
+ your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+/* Called by the kernel when a shutdown has finished. */
+/* This is a dual of seqnos_memory_object_init. */
+kern_return_t
+seqnos_memory_object_terminate (mach_port_t object,
+ mach_port_seqno_t seqno,
+ mach_port_t control,
+ mach_port_t name)
+{
+ struct pager *p;
+ struct lock_request *lr;
+ int wakeup;
+
+ if (!(p = check_port_type (object, pager_port_type)))
+ return EOPNOTSUPP;
+
+ if (control != p->memobjcntl)
+ {
+ printf ("incg terminate: wrong control port");
+ goto out;
+ }
+ if (name != p->memobjname)
+ {
+ printf ("incg terminate: wrong name port");
+ goto out;
+ }
+
+ if (p->pager_type != FILE_DATA && p->pager_type != SINDIR)
+ {
+ printf ("unexpected m_o_terminate\n");
+ goto out;
+ }
+
+ mutex_lock (&p->interlock);
+
+ _pager_wait_for_seqno (p, seqno);
+
+ while (p->noterm)
+ {
+ p->termwaiting = 1;
+ condition_wait (&p->wakeup, &p->interlock);
+ }
+
+ wakeup = 0;
+ for (lr = p->lock_requests; lr; lr = lr->next)
+ {
+ lr->locks_pending = 0;
+ if (!lr->pending_writes)
+ wakeup = 1;
+ }
+ if (wakeup)
+ condition_broadcast (&p->wakeup);
+
+ mach_port_deallocate (mach_task_self (), control);
+ mach_port_deallocate (mach_task_self (), name);
+
+ /* Free the pagemap */
+ if (p->pagemapsize)
+ {
+ vm_deallocate (mach_task_self (), (u_int)p->pagemap, p->pagemapsize);
+ p->pagemapsize = 0;
+ p->pagemap = 0;
+ }
+
+ p->pager_state = NOTINIT;
+ _pager_release_seqno (p);
+
+ mutex_unlock (&p->interlock);
+
+ if (shutting_down)
+ /* Drop the user reference rather than waiting for the user to do it. */
+ done_with_port (p);
+
+ out:
+ done_with_port (p);
+ return 0;
+}
diff --git a/libpager/pagemap.c b/libpager/pagemap.c
new file mode 100644
index 00000000..c09a4d04
--- /dev/null
+++ b/libpager/pagemap.c
@@ -0,0 +1,40 @@
+/* Pagemap manipulation for pager library
+ Copyright (C) 1994 Free Software Foundation
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2, or (at
+ your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+/* Grow the pagemap as necessary to deal with address OFF */
+void
+pagemap_resize (struct pager *p,
+ int off)
+{
+ void *newaddr;
+ int newsize;
+
+ if (p->pagemapsize && !p->pagemap)
+ panic ("pagemap failure");
+
+ off /= __vm_page_size;
+ if (p->pagemapsize >= off)
+ return;
+
+ newsize = round_page (off);
+ vm_allocate (mach_task_self (), (u_int *)&newaddr, newsize, 1);
+ bcopy (p->pagemap, newaddr, p->pagemapsize);
+ vm_deallocate (mach_task_self (), (u_int)p->pagemap, p->pagemapsize);
+ p->pagemap = newaddr;
+ p->pagemapsize = newsize;
+}
diff --git a/libpager/seqnos.c b/libpager/seqnos.c
new file mode 100644
index 00000000..c1a5ba3d
--- /dev/null
+++ b/libpager/seqnos.c
@@ -0,0 +1,41 @@
+/* Sequence number synchronization routines for pager library
+ Copyright (C) 1994 Free Software Foundation
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2, or (at
+ your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* Wait until all preceding messages on this port have
+ had a chance to be honored. */
+void
+_pager_wait_for_seqno (struct pager *p,
+ int seqno)
+{
+ while (seqno != p->seqno + 1)
+ {
+ p->waitingforseqno = 1;
+ condition_wait (&p->wakeup, &p->interlock);
+ }
+ p->seqno = seqno;
+}
+
+/* Allow the next message in. */
+void
+release_seqno (struct pager *p)
+{
+ if (p->waitingforseqno)
+ {
+ p->waitingforseqno = 0;
+ condition_broadcast (&p->wakeup);
+ }
+}
diff --git a/libpager/stubs.c b/libpager/stubs.c
new file mode 100644
index 00000000..a8830d70
--- /dev/null
+++ b/libpager/stubs.c
@@ -0,0 +1,66 @@
+/* Unused memory object interface stubs
+ Copyright (C) 1994 Free Software Foundation
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2, or (at
+ your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+error_t
+seqnos_memory_object_copy (mach_port_t old,
+ mach_port_seqno_t seq,
+ memory_object_control_t old_ctl,
+ vm_offset_t off,
+ vm_size_t len,
+ mach_port_t new)
+{
+ printf ("m_o_copy called\n");
+ return EOPNOTSUPP;
+}
+
+error_t
+seqnos_memory_object_data_write (mach_port_t old,
+ mach_port_seqno_t seq,
+ mach_port_t ctl,
+ vm_offset_t off,
+ pointer_t data,
+ vm_size_t data_cnt)
+{
+ printf ("m_o_data_write called\n");
+ return EOPNOTSUPP;
+}
+
+error_t
+seqnos_memory_object_supply_completed (mach_port_t obj,
+ mach_port_seqno_t seq,
+ mach_port_t ctl,
+ vm_offset_t off,
+ vm_size_t len,
+ error_t result,
+ vm_offset_t err_off)
+{
+ printf ("m_o_supply_completed called\n");
+ return EOPNOTSUPP;
+}
+
+error_t
+seqnos_memory_object_change_completed (mach_port_t obj,
+ mach_port_seqno_t seq,
+ boolean_t maycache,
+ memory_object_copy_strategy_t strat)
+{
+ printf ("m_o_change_completed called\n");
+ return EOPNOTSUPP;
+}
+
+