Merge CV, ver=5.1; ops/methods from HV, and interface from CV where possible

[goodguy/history.git] / cinelerra-5.1 / guicast / sema.C

diff --git a/cinelerra-5.1/guicast/sema.C b/cinelerra-5.1/guicast/sema.C
new file mode 100644 (file)
index 0000000..4bd1de7
--- /dev/null
+++ b/cinelerra-5.1/guicast/sema.C
@@ -0,0 +1,155 @@
+
+/*
+ * CINELERRA
+ * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
+ * 
+ * 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ */
+
+#include "bcsignals.h"
+#include "sema.h"
+
+
+
+
+Sema::Sema(int init_value, const char *title)
+{
+       sem_init(&sem, 0, init_value);
+       this->title = title;
+       this->init_value = init_value;
+}
+
+Sema::~Sema()
+{
+       sem_destroy(&sem);
+       UNSET_ALL_LOCKS(this);
+}
+
+
+void Sema::lock(const char *location)
+{
+       SET_LOCK(this, title, location);
+       sem_wait(&sem);
+       SET_LOCK2
+}
+
+void Sema::unlock()
+{
+       UNSET_LOCK(this);
+       sem_post(&sem);
+}
+
+int Sema::get_value()
+{
+       int result;
+       sem_getvalue(&sem, &result);
+       return result;
+}
+
+void Sema::reset()
+{
+       sem_destroy(&sem);
+       sem_init(&sem, 0, init_value);
+       UNSET_ALL_LOCKS(this)
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+#if 0
+
+#include "bcipc.h"
+#include "sema.h"
+
+Sema::Sema(int id, int number)
+{
+       if(id == -1)
+       {
+               if((semid = semget(IPC_PRIVATE, number, IPC_CREAT | 0777)) < 0) perror("Sema::Sema");
+               for(int i = 0; i < number; i++) unlock(i);
+               client = 0;
+               bc_enter_sema_id(semid);
+       }
+       else
+       {
+               client = 1;
+               this->semid = id;
+       }
+
+       semas = number;
+}
+
+Sema::~Sema()
+{
+       if(!client)
+       {
+               if(semctl(semid, 0, IPC_RMID, arg) < 0) perror("Sema::~Sema");
+               bc_remove_sema_id(semid);
+       }
+}
+
+       
+int Sema::lock(int number)
+{
+       struct sembuf sop;
+       
+// decrease the semaphore
+       sop.sem_num = number;
+       sop.sem_op = -1;
+       sop.sem_flg = 0;
+       if(semop(semid, &sop, 1) < 0) perror("Sema::lock");
+       return 0;
+}
+
+int Sema::unlock(int number)
+{
+       struct sembuf sop;
+       
+// decrease the semaphore
+       sop.sem_num = number;
+       sop.sem_op = 1;
+       sop.sem_flg = 0;
+       if(semop(semid, &sop, 1) < 0) perror("Sema::unlock");
+       return 0;
+}
+
+int Sema::get_value(int number)
+{
+       return semctl(semid, number, GETVAL, arg);
+}
+
+int Sema::get_id()
+{
+       return semid;
+}
+
+
+#endif