diff options
Diffstat (limited to 'nuttx/include/nuttx/sched.h')
| -rw-r--r-- | nuttx/include/nuttx/sched.h | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/nuttx/include/nuttx/sched.h b/nuttx/include/nuttx/sched.h index 6eaba6e9c..b2ec1cee4 100644 --- a/nuttx/include/nuttx/sched.h +++ b/nuttx/include/nuttx/sched.h @@ -1,7 +1,7 @@ /******************************************************************************** * include/nuttx/sched.h * - * Copyright (C) 2007-2012 Gregory Nutt. All rights reserved. + * Copyright (C) 2007-2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt <gnutt@nuttx.org> * * Redistribution and use in source and binary forms, with or without @@ -202,6 +202,10 @@ struct _TCB /* Task Management Fields *****************************************************/ pid_t pid; /* This is the ID of the thread */ +#ifdef CONFIG_SCHED_HAVE_PARENT + pid_t parent; /* This is the ID of the parent thread */ + uint16_t nchildren; /* This is the number active children */ +#endif start_t start; /* Thread start function */ entry_t entry; /* Entry Point into the thread */ @@ -223,7 +227,7 @@ struct _TCB # endif #endif -#ifdef CONFIG_SCHED_WAITPID +#if defined(CONFIG_SCHED_WAITPID) && !defined(CONFIG_SCHED_HAVE_PARENT) sem_t exitsem; /* Support for waitpid */ int *stat_loc; /* Location to return exit status */ #endif @@ -382,6 +386,32 @@ EXTERN FAR struct streamlist *sched_getstreams(void); EXTERN FAR struct socketlist *sched_getsockets(void); #endif /* CONFIG_NSOCKET_DESCRIPTORS */ +/* Internal vfork support.The overall sequence is: + * + * 1) User code calls vfork(). vfork() is provided in architecture-specific + * code. + * 2) vfork()and calls task_vforksetup(). + * 3) task_vforksetup() allocates and configures the child task's TCB. This + * consists of: + * - Allocation of the child task's TCB. + * - Initialization of file descriptors and streams + * - Configuration of environment variables + * - Setup the intput parameters for the task. + * - Initialization of the TCB (including call to up_initial_state() + * 4) vfork() provides any additional operating context. vfork must: + * - Allocate and initialize the stack + * - Initialize special values in any CPU registers that were not + * already configured by up_initial_state() + * 5) vfork() then calls task_vforkstart() + * 6) task_vforkstart() then executes the child thread. + * + * task_vforkabort() may be called if an error occurs between steps 3 and 6. + */ + +FAR _TCB *task_vforksetup(start_t retaddr); +pid_t task_vforkstart(FAR _TCB *child); +void task_vforkabort(FAR _TCB *child, int errcode); + /* sched_foreach will enumerate over each task and provide the * TCB of each task to a user callback functions. Interrupts * will be disabled throughout this enumeration! |