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internal/gamepad: add comments

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This commit is contained in:
Hajime Hoshi 2022-01-29 02:22:10 +09:00
parent 71e17efd80
commit d3cf8935e8
1 changed files with 6 additions and 0 deletions
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6
internal/gamepad/gamepad.go
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@ -90,6 +90,8 @@ func (g *gamepads) get(id driver.GamepadID) *Gamepad {
return g.gamepads[id] return g.gamepads[id]
} }
// find can be invoked from callbacks on the OS's main thread.
// As a callback can be called synchronously from update, using a mutex is not a good idea.
func (g *gamepads) find(cond func(*Gamepad) bool) *Gamepad { func (g *gamepads) find(cond func(*Gamepad) bool) *Gamepad {
for _, gp := range g.gamepads { for _, gp := range g.gamepads {
if gp == nil { if gp == nil {
@ -102,6 +104,8 @@ func (g *gamepads) find(cond func(*Gamepad) bool) *Gamepad {
return nil return nil
} }
// add can be invoked from callbacks on the OS's main thread.
// As a callback can be called synchronously from update, using a mutex is not a good idea.
func (g *gamepads) add(name, sdlID string) *Gamepad { func (g *gamepads) add(name, sdlID string) *Gamepad {
for i, gp := range g.gamepads { for i, gp := range g.gamepads {
if gp == nil { if gp == nil {
@ -122,6 +126,8 @@ func (g *gamepads) add(name, sdlID string) *Gamepad {
return gp return gp
} }
// remove can be invoked from callbacks on the OS's main thread.
// As a callback can be called synchronously from update, using a mutex is not a good idea.
func (g *gamepads) remove(cond func(*Gamepad) bool) { func (g *gamepads) remove(cond func(*Gamepad) bool) {
for i, gp := range g.gamepads { for i, gp := range g.gamepads {
if gp == nil { if gp == nil {