This commit renames all internal OS functions defined under sched/task so that they begin with the prefix. For example, nxtask_exit() vs. task_exit().

Squashed commit of the following:

    Trivial, cosmetic
    sched/, arch/, and include:  Rename task_vforkstart() as nxtask_vforkstart()
    sched/, arch/, and include:  Rename task_vforkabort() as nxtask_vforkabort()
    sched/, arch/, and include:  Rename task_vforksetup() as nxtask_vfork_setup()
    sched/:  Rename notify_cancellation() as nxnotify_cancellation()
    sched/:  Rename task_recover() to nxtask_recover()
    sched/task, sched/pthread/, Documentation/:  Rename task_argsetup() and task_terminate() to nxtask_argsetup() and nxtask_terminate(), respectively.
    sched/task:  Rename task_schedsetup() to nxtask_schedsetup()
    sched/ (plus some binfmt/, include/, and arch/):  Rename task_start() and task_starthook() to nxtask_start() and nxtask_starthook().
    arch/ and sched/:  Rename task_exit() and task_exithook() to nxtask_exit() and nxtask_exithook(), respectively.
    sched/task:  Rename all internal, static, functions to begin with the nx prefix.

arch/arm/src/arm/vfork.S

@@ -71,8 +71,8 @@
  *
  *   1) User code calls vfork().  vfork() collects context information and
  *      transfers control up up_vfork().
- *   2) up_vfork()and calls task_vforksetup().
- *   3) task_vforksetup() allocates and configures the child task's TCB.  This
+ *   2) up_vfork()and calls nxtask_vforksetup().
+ *   3) nxtask_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
@@ -83,8 +83,8 @@
  *      - Allocate and initialize the stack
  *      - Initialize special values in any CPU registers that were not
  *        already configured by up_initial_state()
- *   5) up_vfork() then calls task_vforkstart()
- *   6) task_vforkstart() then executes the child thread.
+ *   5) up_vfork() then calls nxtask_vforkstart()
+ *   6) nxtask_vforkstart() then executes the child thread.
  *
  * Input Parameters:
  *   None

arch/arm/src/armv6-m/vfork.S

@@ -72,8 +72,8 @@
  *
  *   1) User code calls vfork().  vfork() collects context information and
  *      transfers control up up_vfork().
- *   2) up_vfork()and calls task_vforksetup().
- *   3) task_vforksetup() allocates and configures the child task's TCB.  This
+ *   2) up_vfork()and calls nxtask_vforksetup().
+ *   3) nxtask_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
@@ -84,8 +84,8 @@
  *      - Allocate and initialize the stack
  *      - Initialize special values in any CPU registers that were not
  *        already configured by up_initial_state()
- *   5) up_vfork() then calls task_vforkstart()
- *   6) task_vforkstart() then executes the child thread.
+ *   5) up_vfork() then calls nxtask_vforkstart()
+ *   6) nxtask_vforkstart() then executes the child thread.
  *
  * Input Parameters:
  *   None

arch/arm/src/armv7-a/arm_initialstate.c

@@ -101,7 +101,7 @@ void up_initial_state(struct tcb_s *tcb)
   /* Set supervisor-mode and disable FIQs, regardless of how NuttX is
    * configured and of what kind of thread is being started.  That is
    * because all threads, even user-mode threads will start in kernel
-   * trampoline at task_start() or pthread_start().  The thread's
+   * trampoline at nxtask_start() or pthread_start().  The thread's
    * privileges will be dropped before transitioning to user code.
    */
 

arch/arm/src/armv7-a/arm_vfork.S

@@ -73,8 +73,8 @@
  *
  *   1) User code calls vfork().  vfork() collects context information and
  *      transfers control up up_vfork().
- *   2) up_vfork()and calls task_vforksetup().
- *   3) task_vforksetup() allocates and configures the child task's TCB.
+ *   2) up_vfork()and calls nxtask_vforksetup().
+ *   3) nxtask_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
@@ -85,8 +85,8 @@
  *      - Allocate and initialize the stack
  *      - Initialize special values in any CPU registers that were not
  *        already configured by up_initial_state()
- *   5) up_vfork() then calls task_vforkstart()
- *   6) task_vforkstart() then executes the child thread.
+ *   5) up_vfork() then calls nxtask_vforkstart()
+ *   6) nxtask_vforkstart() then executes the child thread.
  *
  * Input Parameters:
  *   None

arch/arm/src/armv7-m/gnu/vfork.S

@@ -73,8 +73,8 @@
  *
  *   1) User code calls vfork().  vfork() collects context information and
  *      transfers control up up_vfork().
- *   2) up_vfork()and calls task_vforksetup().
- *   3) task_vforksetup() allocates and configures the child task's TCB.  This
+ *   2) up_vfork()and calls nxtask_vforksetup().
+ *   3) nxtask_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
@@ -85,8 +85,8 @@
  *      - Allocate and initialize the stack
  *      - Initialize special values in any CPU registers that were not
  *        already configured by up_initial_state()
- *   5) up_vfork() then calls task_vforkstart()
- *   6) task_vforkstart() then executes the child thread.
+ *   5) up_vfork() then calls nxtask_vforkstart()
+ *   6) nxtask_vforkstart() then executes the child thread.
  *
  * Input Parameters:
  *   None

arch/arm/src/armv7-m/iar/vfork.S

@@ -74,8 +74,8 @@
  *
  *   1) User code calls vfork().  vfork() collects context information and
  *      transfers control up up_vfork().
- *   2) up_vfork()and calls task_vforksetup().
- *   3) task_vforksetup() allocates and configures the child task's TCB.  This
+ *   2) up_vfork()and calls nxtask_vforksetup().
+ *   3) nxtask_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
@@ -86,8 +86,8 @@
  *      - Allocate and initialize the stack
  *      - Initialize special values in any CPU registers that were not
  *        already configured by up_initial_state()
- *   5) up_vfork() then calls task_vforkstart()
- *   6) task_vforkstart() then executes the child thread.
+ *   5) up_vfork() then calls nxtask_vforkstart()
+ *   6) nxtask_vforkstart() then executes the child thread.
  *
  * Input Parameters:
  *   None

arch/arm/src/armv7-r/arm_initialstate.c

@@ -113,7 +113,7 @@ void up_initial_state(struct tcb_s *tcb)
   /* Set supervisor-mode and disable FIQs, regardless of how NuttX is
    * configured and of what kind of thread is being started.  That is
    * because all threads, even user-mode threads will start in kernel
-   * trampoline at task_start() or pthread_start().  The thread's
+   * trampoline at nxtask_start() or pthread_start().  The thread's
    * privileges will be dropped before transitioning to user code.
    */
 

arch/arm/src/armv7-r/arm_vfork.S

@@ -73,8 +73,8 @@
  *
  *   1) User code calls vfork().  vfork() collects context information and
  *      transfers control up up_vfork().
- *   2) up_vfork()and calls task_vforksetup().
- *   3) task_vforksetup() allocates and configures the child task's TCB.
+ *   2) up_vfork()and calls nxtask_vforksetup().
+ *   3) nxtask_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
@@ -85,8 +85,8 @@
  *      - Allocate and initialize the stack
  *      - Initialize special values in any CPU registers that were not
  *        already configured by up_initial_state()
- *   5) up_vfork() then calls task_vforkstart()
- *   6) task_vforkstart() then executes the child thread.
+ *   5) up_vfork() then calls nxtask_vforkstart()
+ *   6) nxtask_vforkstart() then executes the child thread.
  *
  * Input Parameters:
  *   None

arch/arm/src/common/up_exit.c

@@ -167,7 +167,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.

arch/arm/src/common/up_vfork.c

@@ -81,8 +81,8 @@
  *
  *   1) User code calls vfork().  vfork() collects context information and
  *      transfers control up up_vfork().
- *   2) up_vfork()and calls task_vforksetup().
- *   3) task_vforksetup() allocates and configures the child task's TCB.  This
+ *   2) up_vfork()and calls nxtask_vforksetup().
+ *   3) nxtask_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
@@ -93,10 +93,10 @@
  *      - Allocate and initialize the stack
  *      - Initialize special values in any CPU registers that were not
  *        already configured by up_initial_state()
- *   5) up_vfork() then calls task_vforkstart()
- *   6) task_vforkstart() then executes the child thread.
+ *   5) up_vfork() then calls nxtask_vforkstart()
+ *   6) nxtask_vforkstart() then executes the child thread.
  *
- * task_vforkabort() may be called if an error occurs between steps 3 and 6.
+ * nxtask_vforkabort() may be called if an error occurs between steps 3 and 6.
  *
  * Input Parameters:
  *   context - Caller context information saved by vfork()
@@ -131,10 +131,10 @@ pid_t up_vfork(const struct vfork_s *context)
 
   /* Allocate and initialize a TCB for the child task. */
 
-  child = task_vforksetup((start_t)(context->lr & ~1), &argsize);
+  child = nxtask_vforksetup((start_t)(context->lr & ~1), &argsize);
   if (!child)
     {
-      serr("ERROR: task_vforksetup failed\n");
+      serr("ERROR: nxtask_vforksetup failed\n");
       return (pid_t)ERROR;
     }
 
@@ -154,7 +154,7 @@ pid_t up_vfork(const struct vfork_s *context)
   if (ret != OK)
     {
       serr("ERROR: up_create_stack failed: %d\n", ret);
-      task_vforkabort(child, -ret);
+      nxtask_vforkabort(child, -ret);
       return (pid_t)ERROR;
     }
 
@@ -266,9 +266,9 @@ pid_t up_vfork(const struct vfork_s *context)
     }
 #endif
 
-  /* And, finally, start the child task.  On a failure, task_vforkstart()
-   * will discard the TCB by calling task_vforkabort().
+  /* And, finally, start the child task.  On a failure, nxtask_vforkstart()
+   * will discard the TCB by calling nxtask_vforkabort().
    */
 
-  return task_vforkstart(child);
+  return nxtask_vforkstart(child);
 }

arch/avr/src/common/up_exit.c

@@ -166,7 +166,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.

arch/hc/src/common/up_exit.c

@@ -166,7 +166,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.

arch/mips/src/common/up_exit.c

@@ -168,7 +168,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.

arch/mips/src/mips32/up_vfork.c

@@ -83,8 +83,8 @@
  *
  *   1) User code calls vfork().  vfork() collects context information and
  *      transfers control up up_vfork().
- *   2) up_vfork()and calls task_vforksetup().
- *   3) task_vforksetup() allocates and configures the child task's TCB.  This
+ *   2) up_vfork()and calls nxtask_vforksetup().
+ *   3) nxtask_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
@@ -95,10 +95,10 @@
  *      - Allocate and initialize the stack
  *      - Initialize special values in any CPU registers that were not
  *        already configured by up_initial_state()
- *   5) up_vfork() then calls task_vforkstart()
- *   6) task_vforkstart() then executes the child thread.
+ *   5) up_vfork() then calls nxtask_vforkstart()
+ *   6) nxtask_vforkstart() then executes the child thread.
  *
- * task_vforkabort() may be called if an error occurs between steps 3 and 6.
+ * nxtask_vforkabort() may be called if an error occurs between steps 3 and 6.
  *
  * Input Parameters:
  *   context - Caller context information saved by vfork()
@@ -151,10 +151,10 @@ pid_t up_vfork(const struct vfork_s *context)
 
   /* Allocate and initialize a TCB for the child task. */
 
-  child = task_vforksetup((start_t)context->ra, &argsize);
+  child = nxtask_vforksetup((start_t)context->ra, &argsize);
   if (!child)
     {
-      sinfo("task_vforksetup failed\n");
+      sinfo("nxtask_vforksetup failed\n");
       return (pid_t)ERROR;
     }
 
@@ -174,7 +174,7 @@ pid_t up_vfork(const struct vfork_s *context)
   if (ret != OK)
     {
       serr("ERROR: up_create_stack failed: %d\n", ret);
-      task_vforkabort(child, -ret);
+      nxtask_vforkabort(child, -ret);
       return (pid_t)ERROR;
     }
 
@@ -254,9 +254,9 @@ pid_t up_vfork(const struct vfork_s *context)
   child->cmn.xcp.regs[REG_GP]  = newsp;        /* Global pointer */
 #endif
 
-  /* And, finally, start the child task.  On a failure, task_vforkstart()
-   * will discard the TCB by calling task_vforkabort().
+  /* And, finally, start the child task.  On a failure, nxtask_vforkstart()
+   * will discard the TCB by calling nxtask_vforkabort().
    */
 
-  return task_vforkstart(child);
+  return nxtask_vforkstart(child);
 }

arch/mips/src/mips32/vfork.S

@@ -71,8 +71,8 @@
  *
  *   1) User code calls vfork().  vfork() collects context information and
  *      transfers control up up_vfork().
- *   2) up_vfork()and calls task_vforksetup().
- *   3) task_vforksetup() allocates and configures the child task's TCB.  This
+ *   2) up_vfork()and calls nxtask_vforksetup().
+ *   3) nxtask_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
@@ -83,8 +83,8 @@
  *      - Allocate and initialize the stack
  *      - Initialize special values in any CPU registers that were not
  *        already configured by up_initial_state()
- *   5) up_vfork() then calls task_vforkstart()
- *   6) task_vforkstart() then executes the child thread.
+ *   5) up_vfork() then calls nxtask_vforkstart()
+ *   6) nxtask_vforkstart() then executes the child thread.
  *
  * Input Parameters:
  *   None

arch/misoc/src/lm32/lm32_exit.c

@@ -161,7 +161,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.

arch/or1k/src/common/up_exit.c

@@ -166,7 +166,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.

arch/renesas/src/common/up_exit.c

@@ -166,7 +166,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.

arch/risc-v/src/common/up_exit.c

@@ -168,7 +168,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.

arch/risc-v/src/rv32im/up_vfork.c

@@ -83,8 +83,8 @@
  *
  *   1) User code calls vfork().  vfork() collects context information and
  *      transfers control up up_vfork().
- *   2) up_vfork()and calls task_vforksetup().
- *   3) task_vforksetup() allocates and configures the child task's TCB.  This
+ *   2) up_vfork()and calls nxtask_vforksetup().
+ *   3) nxtask_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
@@ -95,10 +95,10 @@
  *      - Allocate and initialize the stack
  *      - Initialize special values in any CPU registers that were not
  *        already configured by up_initial_state()
- *   5) up_vfork() then calls task_vforkstart()
- *   6) task_vforkstart() then executes the child thread.
+ *   5) up_vfork() then calls nxtask_vforkstart()
+ *   6) nxtask_vforkstart() then executes the child thread.
  *
- * task_vforkabort() may be called if an error occurs between steps 3 and 6.
+ * nxtask_vforkabort() may be called if an error occurs between steps 3 and 6.
  *
  * Input Parameters:
  *   context - Caller context information saved by vfork()
@@ -155,10 +155,10 @@ pid_t up_vfork(const struct vfork_s *context)
 
   /* Allocate and initialize a TCB for the child task. */
 
-  child = task_vforksetup((start_t)context->ra, &argsize);
+  child = nxtask_vforksetup((start_t)context->ra, &argsize);
   if (!child)
     {
-      sinfo("task_vforksetup failed\n");
+      sinfo("nxtask_vforksetup failed\n");
       return (pid_t)ERROR;
     }
 
@@ -178,7 +178,7 @@ pid_t up_vfork(const struct vfork_s *context)
   if (ret != OK)
     {
       serr("ERROR: up_create_stack failed: %d\n", ret);
-      task_vforkabort(child, -ret);
+      nxtask_vforkabort(child, -ret);
       return (pid_t)ERROR;
     }
 
@@ -258,11 +258,11 @@ pid_t up_vfork(const struct vfork_s *context)
   child->cmn.xcp.regs[REG_GP]  = newsp;        /* Global pointer */
 #endif
 
-  /* And, finally, start the child task.  On a failure, task_vforkstart()
-   * will discard the TCB by calling task_vforkabort().
+  /* And, finally, start the child task.  On a failure, nxtask_vforkstart()
+   * will discard the TCB by calling nxtask_vforkabort().
    */
 
-  return task_vforkstart(child);
+  return nxtask_vforkstart(child);
 }
 
 #endif /* CONFIG_ARCH_HAVE_VFORK */

arch/sim/src/up_exit.c

@@ -75,7 +75,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.

arch/x86/src/common/up_exit.c

@@ -166,7 +166,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.

arch/xtensa/src/common/xtensa_exit.c

@@ -173,7 +173,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.

arch/z16/src/common/up_exit.c

@@ -166,7 +166,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.

arch/z80/src/common/up_exit.c

@@ -168,7 +168,7 @@ void _exit(int status)
 
   /* Destroy the task at the head of the ready to run list. */
 
-  (void)task_exit();
+  (void)nxtask_exit();
 
   /* Now, perform the context switch to the new ready-to-run task at the
    * head of the list.