diff options
| author | Jerome Forissier <[email protected]> | 2025-04-18 16:09:42 +0200 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2025-04-23 13:19:44 -0600 |
| commit | ec89a4f7a3cbdfe601a45c110b375e925190f095 (patch) | |
| tree | 0cc58c3b91f33ddc658ab24a4b94b5ac375e6af7 /cmd/Kconfig | |
| parent | 1c0f6999b5589315201ebb5aa659eb6658079b8e (diff) | |
cmd: add spawn and wait commands
Add a spawn command which runs another command in the background, as
well as a wait command to suspend the shell until one or more background
jobs have completed. The job_id environment variable is set by spawn and
wait accepts optional job ids, so that one can selectively wait on any
job.
Example:
=> date; spawn sleep 5; spawn sleep 3; date; echo "waiting..."; wait; date
Date: 2025-02-21 (Friday) Time: 17:04:52
Date: 2025-02-21 (Friday) Time: 17:04:52
waiting...
Date: 2025-02-21 (Friday) Time: 17:04:57
=>
Another example showing how background jobs can make initlizations
faster. The board is i.MX93 EVK, with one spinning HDD connected to
USB1 via a hub, and a network cable plugged into ENET1.
# From power up / reset
u-boot=> setenv autoload 0
u-boot=> setenv ud "usb start; dhcp"
u-boot=> time run ud
[...]
time: 8.058 seconds
# From power up / reset
u-boot=> setenv autoload 0
u-boot=> setenv ud "spawn usb start; spawn dhcp; wait"
u-boot=> time run ud
[...]
time: 4.475 seconds
Signed-off-by: Jerome Forissier <[email protected]>
Acked-by: Ilias Apalodimas <[email protected]>
Diffstat (limited to 'cmd/Kconfig')
| -rw-r--r-- | cmd/Kconfig | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/cmd/Kconfig b/cmd/Kconfig index c2ce519d1e3..2d31abcef73 100644 --- a/cmd/Kconfig +++ b/cmd/Kconfig @@ -3081,4 +3081,21 @@ config CMD_MESON help Enable useful commands for the Meson Soc family developed by Amlogic Inc. +config CMD_SPAWN + bool "spawn and wait commands" + depends on UTHREAD + help + spawn runs a command in the background and sets the job_id environment + variable. wait is used to suspend the shell execution until one or more + jobs are complete. + +config CMD_SPAWN_NUM_JOBS + int "Maximum number of simultaneous jobs for spawn" + default 16 + help + Job identifiers are in the range 1..CMD_SPAWN_NUM_JOBS. In other words + there can be no more that CMD_SPAWN_NUM_JOBS running simultaneously. + When a jobs exits, its identifier is available to be re-used by the next + spawn command. + endif |