mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2014.
|
|
|
|
This file is part of Sortix.
|
|
|
|
Sortix 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 3 of the License, or (at your option) any later
|
|
version.
|
|
|
|
Sortix 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
|
|
Sortix. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
ptable.cpp
|
|
Process table.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
|
|
#include <sortix/kernel/kthread.h>
|
|
#include <sortix/kernel/ptable.h>
|
|
#include <sortix/kernel/refcount.h>
|
|
|
|
// TODO: Process memory ownership needs to be reference counted.
|
|
// TODO: There is no proper way to iterate all the existing processes.
|
|
// TODO: This implementation is rather run-time inefficient.
|
|
// TODO: The Free method potentially leaks memory as the ptable is never shrunk.
|
|
// TODO: The next_pid counter could potentially overflow.
|
|
|
|
namespace Sortix {
|
|
|
|
ProcessTable::ProcessTable()
|
|
{
|
|
ptablelock = KTHREAD_MUTEX_INITIALIZER;
|
|
next_pid = 0;
|
|
entries = NULL;
|
|
entries_used = 0;
|
|
entries_length = 0;
|
|
}
|
|
|
|
ProcessTable::~ProcessTable()
|
|
{
|
|
delete[] entries;
|
|
}
|
|
|
|
Process* ProcessTable::Get(pid_t pid)
|
|
{
|
|
ScopedLock lock(&ptablelock);
|
|
for ( size_t i = 0; i < entries_used; i++ )
|
|
if ( entries[i].pid == pid )
|
|
return entries[i].process;
|
|
return errno = ESRCH, (Process*) NULL;
|
|
}
|
|
|
|
pid_t ProcessTable::Allocate(Process* process)
|
|
{
|
|
ScopedLock lock(&ptablelock);
|
|
if ( entries_used == entries_length )
|
|
{
|
|
size_t new_length = entries_length ? 2 * entries_length : 64;
|
|
struct ptable_entry* new_entries = new struct ptable_entry[new_length];
|
|
if ( !new_entries )
|
|
return -1;
|
|
memcpy(new_entries, entries, sizeof(struct ptable_entry) * entries_length);
|
|
delete[] entries;
|
|
entries = new_entries;
|
|
entries_length = new_length;
|
|
}
|
|
|
|
struct ptable_entry* entry = &entries[entries_used++];
|
|
entry->process = process;
|
|
return entry->pid = next_pid++;
|
|
}
|
|
|
|
void ProcessTable::Free(pid_t pid)
|
|
{
|
|
ScopedLock lock(&ptablelock);
|
|
for ( size_t i = 0; i < entries_used; i++ )
|
|
{
|
|
if ( entries[i].pid != pid )
|
|
continue;
|
|
entries[i] = entries[--entries_used];
|
|
return;
|
|
}
|
|
assert(false);
|
|
}
|
|
|
|
} // namespace Sortix
|