Mirrors_Framework/nuttx
1
0
Fork 0
mirror of https://github.com/apache/nuttx.git synced 2026-05-26 10:46:28 +08:00
Code Issues Actions 2 Packages Projects Releases Wiki Activity

Squashed commit of the following:

Browse Source 
task_spawn() and posix_spawn() are NuttX OS interfaces.  In PROTECTED and KERNEL build modes, then can be reached from applications only via a system call.  Currently, the number of parameters in a system call is limited to six; these spawn function have seven parameters.  Rather than extend the maximum number of parameters across all architectures, I opted instead to marshal the seven parameters into a structure.
     *

In order to support builtin in function in protected mode, a task_spawn() system call must be supported.  Unfortunately this is overly complex because there is a (soft) limit of 6 parameters in a system call; task_spawn has seven paramters.  This is a soft limit but still difficult to extend because it involves assembly language changes to numerous architectures.  Better to get more creative.
This commit is contained in:
Gregory Nutt
2019-08-23 13:20:52 -06:00
parent bff30ff9bc
commit 3c30cf1f05
8 changed files with 164 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/syscall.h
+2 -1
View File
@@ -128,7 +128,8 @@
#ifndef CONFIG_BUILD_KERNEL
# define SYS_task_create __SYS_task_create
# define __SYS_task_delete (__SYS_task_create + 1)
# define SYS_nx_task_spawn (__SYS_task_create + 1)
# define __SYS_task_delete (__SYS_task_create + 2)
/* pgalloc() is only available with address environments with the page
* allocator selected. MMU support from the CPU is also required.