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/*
htop - Scheduling.c
(C) 2023 htop dev team
Released under the GNU GPLv2+, see the COPYING file
in the source distribution for its full text.
*/
#include "config.h" // IWYU pragma: keep
#include "Scheduling.h"
#ifdef SCHEDULER_SUPPORT
#include <assert.h>
#include <stddef.h>
#include "FunctionBar.h"
#include "ListItem.h"
#include "Macros.h"
#include "Object.h"
#include "Panel.h"
#include "XUtils.h"
static const SchedulingPolicy policies[] = {
[SCHED_OTHER] = { "Other", SCHED_OTHER, false },
#ifdef SCHED_BATCH
[SCHED_BATCH] = { "Batch", SCHED_BATCH, false },
#endif
#ifdef SCHED_IDLE
[SCHED_IDLE] = { "Idle", SCHED_IDLE, false },
#endif
[SCHED_FIFO] = { "FiFo", SCHED_FIFO, true },
[SCHED_RR] = { "RoundRobin", SCHED_RR, true },
};
#ifdef SCHED_RESET_ON_FORK
static bool reset_on_fork = false;
#endif
Panel* Scheduling_newPolicyPanel(int preSelectedPolicy) {
Panel* this = Panel_new(0, 0, 0, 0, Class(ListItem), true, FunctionBar_newEnterEsc("Select ", "Cancel "));
Panel_setHeader(this, "New policy:");
#ifdef SCHED_RESET_ON_FORK
Panel_add(this, (Object*) ListItem_new(reset_on_fork ? "Reset on fork: on" : "Reset on fork: off", -1));
#endif
for (unsigned i = 0; i < ARRAYSIZE(policies); i++) {
if (!policies[i].name)
continue;
Panel_add(this, (Object*) ListItem_new(policies[i].name, policies[i].id));
if (policies[i].id == preSelectedPolicy)
Panel_setSelected(this, i);
}
return this;
}
void Scheduling_togglePolicyPanelResetOnFork(Panel* schedPanel) {
#ifdef SCHED_RESET_ON_FORK
reset_on_fork = !reset_on_fork;
ListItem* item = (ListItem*) Panel_get(schedPanel, 0);
free_and_xStrdup(&item->value, reset_on_fork ? "Reset on fork: on" : "Reset on fork: off");
#else
(void)schedPanel;
#endif
}
Panel* Scheduling_newPriorityPanel(int policy, int preSelectedPriority) {
if (policy < 0 || (unsigned)policy >= ARRAYSIZE(policies) || policies[policy].name == NULL)
return NULL;
if (!policies[policy].prioritySupport)
return NULL;
int min = sched_get_priority_min(policy);
if (min < 0)
return NULL;
int max = sched_get_priority_max(policy);
if (max < 0 )
return NULL;
Panel* this = Panel_new(0, 0, 0, 0, Class(ListItem), true, FunctionBar_newEnterEsc("Select ", "Cancel "));
Panel_setHeader(this, "Priority:");
for (int i = min; i <= max; i++) {
char buf[16];
xSnprintf(buf, sizeof(buf), "%d", i);
Panel_add(this, (Object*) ListItem_new(buf, i));
if (i == preSelectedPriority)
Panel_setSelected(this, i);
}
return this;
}
static bool Scheduling_setPolicy(Process* p, Arg arg) {
const SchedulingArg* sarg = arg.v;
int policy = sarg->policy;
assert(policy >= 0);
assert((unsigned)policy < ARRAYSIZE(policies));
assert(policies[policy].name);
const struct sched_param param = { .sched_priority = policies[policy].prioritySupport ? sarg->priority : 0 };
#ifdef SCHED_RESET_ON_FORK
if (reset_on_fork)
policy &= SCHED_RESET_ON_FORK;
#endif
int r = sched_setscheduler(Process_getPid(p), policy, ¶m);
/* POSIX says on success the previous scheduling policy should be returned,
* but Linux always returns 0. */
return r != -1;
}
bool Scheduling_rowSetPolicy(Row* row, Arg arg) {
Process* p = (Process*) row;
assert(Object_isA((const Object*) p, (const ObjectClass*) &Process_class));
return Scheduling_setPolicy(p, arg);
}
const char* Scheduling_formatPolicy(int policy) {
#ifdef SCHED_RESET_ON_FORK
policy = policy & ~SCHED_RESET_ON_FORK;
#endif
switch (policy) {
case SCHED_OTHER:
return "OTHER";
case SCHED_FIFO:
return "FIFO";
case SCHED_RR:
return "RR";
#ifdef SCHED_BATCH
case SCHED_BATCH:
return "BATCH";
#endif
#ifdef SCHED_IDLE
case SCHED_IDLE:
return "IDLE";
#endif
#ifdef SCHED_DEADLINE
case SCHED_DEADLINE:
return "EDF";
#endif
default:
return "???";
}
}
/*
* Gather scheduling policy (thread-specific data)
*/
void Scheduling_readProcessPolicy(Process* proc) {
proc->scheduling_policy = sched_getscheduler(Process_getPid(proc));
}
#endif /* SCHEDULER_SUPPORT */
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