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Update TODO list.

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Gregory Nutt 2019-01-05 14:55:19 -06:00
parent 96d638d277
commit 3e8bd2b5dc
1 changed files with 7 additions and 6 deletions
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@ -420,10 +420,11 @@ o Task/Scheduler (sched/)
Title: DAEMONIZE ELF PROGRAM Title: DAEMONIZE ELF PROGRAM
Description: It is a common practice to "daemonize" to detach a task from Description: It is a common practice to "daemonize" to detach a task from
its parent. This is used with NSH, for example, so that NSH its parent. This is used with NSH, for example, so that NSH
will stall, waiting in waitpid() for the child task to exit. will not stall, waiting in waitpid() for the child task to
exit.
Daemonization is done to creating a new task which continues Daemonization is done to creating a new task which continues
to run while the origin task exits (sending the SIGCHLD to run while the original task exits (sending the SIGCHLD
signal to the parent and awakening waitpid()). In a pure signal to the parent and awakening waitpid()). In a pure
POSIX system, this is down with fork(), perhaps like: POSIX system, this is down with fork(), perhaps like:
@ -432,11 +433,11 @@ o Task/Scheduler (sched/)
exit(); exit();
} }
but is usually down with task_create() in NuttX. But when but is usually done with task_create() in NuttX. But when
task_create() is called from within an ELF program, a very task_create() is called from within an ELF program, a very
perverse situation is created. perverse situation is created:
The basic problem is address environments and task groups: The basic problem involves address environments and task groups:
"Task groups" are emulations of Linux processes. For the "Task groups" are emulations of Linux processes. For the
case of the FLAT, ELF module, the address environment is case of the FLAT, ELF module, the address environment is
allocated memory that contains the ELF module. allocated memory that contains the ELF module.
@ -454,7 +455,7 @@ o Task/Scheduler (sched/)
When ELF program exits, the address environment is destroyed When ELF program exits, the address environment is destroyed
and the other task running in the same address environment is and the other task running in the same address environment is
running in stale memory and will eventually crash. then running in stale memory and will eventually crash.
Nothing special happens when the other created task running Nothing special happens when the other created task running
in the allocated address environment exits since has no such in the allocated address environment exits since has no such