Timers: GLib Reference Manual

## Timers Timers — keep track of elapsed time |

## Functions

GTimer * | g_timer_new ()
void | g_timer_start ()
void | g_timer_stop ()
void | g_timer_continue ()
gdouble | g_timer_elapsed ()
void | g_timer_reset ()
void | g_timer_destroy ()

## Types and Values

| GTimer

## Includes

    #include <glib.h>

## Description

GTimer records a start time, and counts microseconds elapsed since that time. This is done somewhat differently on different platforms, and can be tricky to get exactly right, so GTimer provides a portable/convenient interface.

## Functions

### g_timer_new ()

    GTimer *
    g_timer_new (void);

Creates a new timer, and starts timing (i.e. `g_timer_start()` is implicitly called for you).

#### Returns

a new GTimer.

### g_timer_start ()

    void
    g_timer_start (GTimer *timer);

Marks a start time, so that future calls to `g_timer_elapsed()` will report the time since `g_timer_start()` was called. `g_timer_new()` automatically marks the start time, so no need to call `g_timer_start()` immediately after creating the timer.

#### Parameters

timer | a GTimer. |

### g_timer_stop ()

    void
    g_timer_stop (GTimer *timer);

Marks an end time, so calls to `g_timer_elapsed()` will return the difference between this end time and the start time.

#### Parameters

timer | a GTimer. |

### g_timer_continue ()

    void
    g_timer_continue (GTimer *timer);

Resumes a timer that has previously been stopped with `g_timer_stop()`. `g_timer_stop()` must be called before using this function.

#### Parameters

timer | a GTimer. |

Since: 2.4

### g_timer_elapsed ()

    gdouble
    g_timer_elapsed (GTimer *timer,
                     gulong *microseconds);

If `timer` has been started but not stopped, obtains the time since the timer was started. If `timer` has been stopped, obtains the elapsed time between the time it was started and the time it was stopped. The return value is the number of seconds elapsed, including any fractional part. The `microseconds` out parameter is essentially useless.

#### Parameters

timer | a GTimer. |
microseconds | return location for the fractional part of seconds elapsed, in microseconds (that is, the total number of microseconds elapsed, modulo 1000000), or `NULL` |

#### Returns

seconds elapsed as a floating point value, including any fractional part.

### g_timer_reset ()

    void
    g_timer_reset (GTimer *timer);

This function is useless; it's fine to call `g_timer_start()` on an already-started timer to reset the start time, so `g_timer_reset()` serves no purpose.

#### Parameters

timer | a GTimer. |

### g_timer_destroy ()

    void
    g_timer_destroy (GTimer *timer);

Destroys a timer, freeing associated resources.

#### Parameters

timer | a GTimer to destroy. |

## Types and Values

### GTimer

    typedef struct _GTimer GTimer;

Opaque datatype that records a start time.