htop/TasksMeter.c
Lucas C. Villa Real ad99187680 htop scans /proc to determine how many running tasks exist. Since that
operation is not possible to be conducted in an atomic fashion, task
scheduling effects can lead to a count greater than the number of actual
processors; this is more easily noticed on machines with several CPUs
and under heavy workload.
This patch simply adds an upper bound on cpuCount to guarantee
consistent reports of the number of running tasks at any given time.
2018-01-23 14:11:47 -02:00

84 lines
2.6 KiB
C

/*
htop - TasksMeter.c
(C) 2004-2011 Hisham H. Muhammad
Released under the GNU GPL, see the COPYING file
in the source distribution for its full text.
*/
#include "TasksMeter.h"
#include "Platform.h"
#include "CRT.h"
/*{
#include "Meter.h"
}*/
int TasksMeter_attributes[] = {
CPU_KERNEL, PROCESS_THREAD, PROCESS, TASKS_RUNNING
};
static void TasksMeter_updateValues(Meter* this, char* buffer, int len) {
ProcessList* pl = this->pl;
this->values[0] = pl->kernelThreads;
this->values[1] = pl->userlandThreads;
this->values[2] = pl->totalTasks - pl->kernelThreads - pl->userlandThreads;
this->values[3] = MIN(pl->runningTasks, pl->cpuCount);
if (pl->totalTasks > this->total) {
this->total = pl->totalTasks;
}
if (this->pl->settings->hideKernelThreads) {
this->values[0] = 0;
}
xSnprintf(buffer, len, "%d/%d", (int) this->values[3], (int) this->total);
}
static void TasksMeter_display(Object* cast, RichString* out) {
Meter* this = (Meter*)cast;
Settings* settings = this->pl->settings;
char buffer[20];
int processes = (int) this->values[2];
xSnprintf(buffer, sizeof(buffer), "%d", processes);
RichString_write(out, CRT_colors[METER_VALUE], buffer);
int threadValueColor = CRT_colors[METER_VALUE];
int threadCaptionColor = CRT_colors[METER_TEXT];
if (settings->highlightThreads) {
threadValueColor = CRT_colors[PROCESS_THREAD_BASENAME];
threadCaptionColor = CRT_colors[PROCESS_THREAD];
}
if (!settings->hideUserlandThreads) {
RichString_append(out, CRT_colors[METER_TEXT], ", ");
xSnprintf(buffer, sizeof(buffer), "%d", (int)this->values[1]);
RichString_append(out, threadValueColor, buffer);
RichString_append(out, threadCaptionColor, " thr");
}
if (!settings->hideKernelThreads) {
RichString_append(out, CRT_colors[METER_TEXT], ", ");
xSnprintf(buffer, sizeof(buffer), "%d", (int)this->values[0]);
RichString_append(out, threadValueColor, buffer);
RichString_append(out, threadCaptionColor, " kthr");
}
RichString_append(out, CRT_colors[METER_TEXT], "; ");
xSnprintf(buffer, sizeof(buffer), "%d", (int)this->values[3]);
RichString_append(out, CRT_colors[TASKS_RUNNING], buffer);
RichString_append(out, CRT_colors[METER_TEXT], " running");
}
MeterClass TasksMeter_class = {
.super = {
.extends = Class(Meter),
.delete = Meter_delete,
.display = TasksMeter_display,
},
.updateValues = TasksMeter_updateValues,
.defaultMode = TEXT_METERMODE,
.maxItems = 4,
.total = 100.0,
.attributes = TasksMeter_attributes,
.name = "Tasks",
.uiName = "Task counter",
.caption = "Tasks: "
};