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1214 Commits

Author SHA1 Message Date
Gregory Nutt
b51b72b2db pthreads: Re-order some operations so that mutexes are placed in the inconsistent state BEFORE the clean-up callbacks are called. 2017-04-10 08:11:16 -06:00
Jussi Kivilinna
dffb8a67e3 Add entropy pool and strong random number generator 
Entropy pool gathers environmental noise from device drivers, user-space, etc., and returns good random numbers, suitable for cryptographic use. Based on entropy pool design from *BSDs and uses BLAKE2Xs algorithm for CSPRNG output.

Patch also adds /dev/urandom support for using entropy pool RNG and new 'getrandom' system call for getting randomness without file-descriptor usage (thus avoiding file-descriptor exhaustion attacks). The 'getrandom' interface is similar as 'getentropy' and 'getrandom' available on OpenBSD and Linux respectively.
 2017-03-30 07:38:37 -06:00
Gregory Nutt
eb344d7260 Fix an assertion noted by Jussi Kivilinna. 
This was a consequence of the recent robust mutex changes.  If robust mutexes are selected, then each mutex that a thread takes is retained in a list in threads TCB.  If the thread exits and that list is not empty, then we know that the thread exitted while holding mutexes.  And, in that case, each will be marked as inconsistent and the any waiter for the thread is awakened.

For the case of pthread_mutex_trywait(), the mutex was not being added to the list!  while not usually a fatal error, this was caught by an assertion when pthread_mutex_unlock() was called:  It tried to remove the mutex from the TCB list and it was not there when, of course, it shoule be.

The fix was to add pthread_mutex_trytake() which does sem_trywait() and if successful, does correctly add the mutext to the TCB list.  This should eliminated the assertion.
 2017-03-29 07:50:40 -06:00
Gregory Nutt
941360bf12 Correct some spacing 2017-03-27 10:49:41 -06:00
Gregory Nutt
b07d3fc305 Rename CONFIG_MUTEX_TYPES to CONFIG_PTHREAD_MUTEX_TYPES 2017-03-27 09:08:14 -06:00
Gregory Nutt
f2f798cb29 pthread mutexes: Finish logic to support configuration mutex robustness. 2017-03-27 08:50:45 -06:00
Gregory Nutt
666208cf23 pthread mutexes: Add option to support both unsafe and robust mutexes via pthread_mutexattr_get/setrobust(). 2017-03-26 18:37:24 -06:00
Gregory Nutt
8b3c554e45 pthreads: Add a configuration option to disable robust mutexes and revert to the traditional unsafe mutexes. 2017-03-26 17:37:28 -06:00
Gregory Nutt
86ab384d77 Forget to add some files in previous commits 2017-03-26 15:46:19 -06:00
Gregory Nutt
8b23c16b90 pthreads: pthread_mutex_consistent() needs to clear flags. 2017-03-26 14:44:57 -06:00
Gregory Nutt
34c5e1c18f Minor cleanup from recent changes. 2017-03-26 14:04:07 -06:00
Gregory Nutt
5a69453e16 pthreads: Add some assertions. 2017-03-26 13:54:43 -06:00
Gregory Nutt
fe03ef02c4 when pthread exits or is cancelled, mutexes held by thread are marked inconsistent and the highest priority thread waiting for the mutex is awakened. 2017-03-26 13:37:05 -06:00
Gregory Nutt
6e623ce06f pthreads: Partial implementation of final part of robust mutexes: Keep list of all mutexes held by a thread in a list in the TCB. 2017-03-26 12:46:57 -06:00
Gregory Nutt
2c37d369ab pthread: Fix return value of pthread_give/takesemaphore(). Add option to pthread_takesemaphore to ignore EINTR or not. 2017-03-26 11:22:17 -06:00
Gregory Nutt
363403fb1f pthreads: Add more robustness characteristics: pthread_mutex_lock() and trylock() will now return EOWNERDEAD if the mutex is locked by a thread that no longer exists. Add pthread_mutex_consistent() to recover from this situation. 2017-03-26 10:35:23 -06:00
Gregory Nutt
5fb85451cb Update some comments 2017-03-22 08:08:43 -06:00
Gregory Nutt
f5a957158d Review of last PR: Setting CONFIG_SMP_NCPUS=1 should only be permitted in a debug configuration. 2017-03-22 06:29:38 -06:00
Masayuki Ishikawa
a1f0802855 Kconfig: Change the minimum SMP_NCPUS to 1 2017-03-22 10:04:37 +09:00
Gregory Nutt
6893843cc5 sched/semaphore: Fix a warning aout an unused variable when priority inheritance is enabled. 2017-03-21 13:47:56 -06:00
Gregory Nutt
e8e3c2f362 sched/semaphore: Convert strange use of DEBUGASSERT to DEBUGPANIC. 2017-03-21 13:34:17 -06:00
David Sidrane
d76157db7b sem_holder:Clean up from Review 
Spelling and backward DEBUGASSERT along with one gem

  if (sem->holder[0].htcb != NULL || sem->holder[**1**].htcb != NULL)
 2017-03-21 08:03:06 -10:00
David Sidrane
7601a27cee sem_holder:The logic for the list version is unchanged 2017-03-16 14:16:18 -10:00
David Sidrane
3cc2a4f7c9 sem_holder: Fixes improper restoration of base_priority 
in the case of CONFIG_SEM_PREALLOCHOLDERS=0

   The call to sem_restorebaseprio_task context switches in the
   sem_foreachholder(sem, sem_restoreholderprioB, stcb); call
   prior to releasing the holder. So the running task is left
   as a holder as is the started task. Leaving both slots filled
   Thus failing to perforem the boost/or restoration on the
   correct tcb.

   This PR fixes this by releasing the running task slot prior
   to reprioritization that can lead to the context switch.
   To faclitate this, the interface to sem_restorebaseprio
   needed to take the tcb from the holder prior to the
   holder being freed. In the failure case where sched_verifytcb
   fails it added the overhead of looking up the holder.

   There is also the adfitinal thunking on the foreach to
   get from holer to holder->tcb.

   An alternate approach could be to leve the interface the same
   and allocate a holder on the stack of sem_restoreholderprioB
   copy the sem's holder to it, free it as is done in this pr
   and and then pass that address sem_restoreholderprio as the
   holder. It could then get the holder's tcb but we would
   keep the same sem_findholder in sched_verifytcb.
 2017-03-15 17:12:45 -10:00
David Sidrane
55fb9645a7 Guard from pend_reprios overlow 2017-03-15 07:42:55 -10:00
David Sidrane
caf8bac7fb missing semi 2017-03-13 22:54:13 +00:00
David Sidrane
d66fd9f965 semaphore:sem_boostholderprio prevent overrun of pend_reprios 
The second case rtcb->sched_priority <= htcb->sched_priority
  did not check if there is sufficient space in the pend_reprios
  array.
 2017-03-13 12:34:39 -10:00
David Sidrane
3c00651cfe semaphore:sem_holder sem_findholder missing inintalization of pholder 
sem_findholder would fail and code optimization coverd this up.
 2017-03-13 11:56:31 -10:00
David Sidrane
4d760c5ea4 semaphore:sem_holder add DEBUGASSERT s 2017-03-13 10:46:26 -10:00
Gregory Nutt
399f306744 A few cosmetic changes 2017-03-11 08:58:42 -06:00
David Sidrane
6cc8f9100b Priority Inversion fixes:typo 2017-03-10 06:37:46 -10:00
Gregory Nutt
360539afac Priority inheritance: When CONFIG_SEM_PREALLOCHOLDERS==0, there is only a single, hard-allocated holder structure. This is problem because in sem_wait() the holder is released, but needs to remain in the holder container until sem_restorebaseprio() is called. The call to sem_restorebaseprio() must be one of the last things the sem_wait() does because it can cause the task to be suspended. If in sem_wait(), a new task gets the semaphore count then it will fail to allocate the holder and will not participate in priority inheritance. This fix is to add two hard-allocated holders in the sem_t structure: One of the old holder and one for the new holder. 2017-03-10 09:30:15 -06:00
Gregory Nutt
a93e46d00c Cosmetic 2017-03-10 08:54:50 -06:00
Gregory Nutt
c976a66f8d net/drivers/skeleton.c: Back out serialization changes of the last commit. They are not necessary in the skeleton.c example because the calls to net_lock() at the beginning of each worker function will enforce serialization. 2017-03-04 11:33:36 -06:00
Gregory Nutt
b55a98e900 Olimex-STM32-P407: Enable task names 2017-03-04 08:49:24 -06:00
Gregory Nutt
47ebe1e320 Update some comments 2017-03-03 12:48:58 -06:00
Gregory Nutt
e1218c4b4b Smaller vector tables: Add irq_mapped_t. 2017-03-03 10:20:40 -06:00
Gregory Nutt
04c9ccdd2d Update TODO list and some Kconfig comments. 2017-03-03 09:20:25 -06:00
Gregory Nutt
c2b620b4f8 Implements support for smaller interrupt tables as described at http://www.nuttx.org/doku.php?id=wiki:howtos:smallvectors . This is largely the work of Mark Schulte. However, I have made several changes to match with the Wiki document. If you like the change, thanks go to Marc. For any errors you can blame me. 2017-03-03 09:20:25 -06:00
Masayuki Ishikawa
d78113e4ad Revert "CONFIG_START_YEAR/MONTH/DAY not required if an RTC is used" 
This reverts commit 4035ed8c6c.
 2017-03-03 10:42:10 +09:00
Masayuki Ishikawa
54b1f5ce2a Merged in masayuki2009/nuttx.nuttx/remove_unused_variable (pull request #233) 
Remove unused variable

Approved-by: Gregory Nutt
 2017-03-02 12:39:32 +00:00
Gregory Nutt
094795e0ed Review parameter usage in sigtimedwait(); update some comments. 2017-03-02 06:39:05 -06:00
Masayuki Ishikawa
237e041fba Remove an unused variable when calling sigwaitinfo() 2017-03-02 13:14:00 +09:00
Masayuki Ishikawa
4043239cfc Remove an unused variable when calling sigtimedwait() 2017-03-02 13:13:53 +09:00
Gregory Nutt
02b1e1ec1a Fixes for coding standard: '*' needs to 'snuggle' with following variable name 2017-02-28 18:22:57 -06:00
Gregory Nutt
840c5935a3 Correct a typo from one of the preceding commits. 2017-02-27 11:58:20 -06:00
Mark Schulte
b3222bbc8a irq_dispatch: Add argument pointer to irq_dispatch 
Provide a user defined callback context for irq's, such that when
registering a callback users can provide a pointer that will get
passed back when the isr is called.
 2017-02-27 06:27:56 -06:00
Gregory Nutt
4dbc0a27c6 pthread_create: g_pthreadname[] is not used if CONFIG_TASK_NAME_SIZE==0. 2017-02-26 18:15:16 -06:00
Gregory Nutt
12a4a58aa6 Update some wdog-related comments 2017-02-24 10:58:37 -06:00
Gregory Nutt
dca77fa06a sigtimedwait: When timer expires, up_unblock_task() is called. This is okay in the single CPU case because interrupts are disable in the timer interrupt handler. But it is insufficient in the SMP case. enter_ and leave_critical_section() must be called in order to manage spinlocks correctly. 2017-02-24 10:07:23 -06:00
Gregory Nutt
cb7c5f9921 Implement strings.h macros as inline functions when possible for better C++ compatibility. 2017-02-22 10:20:58 -06:00
Gregory Nutt
4f5879f998 C library: Add ffs(). Add strings.h. Move strcasecmp, strncasecmp, bzero, bcmp, and bcopy to where they belong in strings.h.h, not string.h. bzero, bcmp, and bcopy are legacy functions; the contemporary counterparts should be used instead. 2017-02-16 16:10:09 -06:00
Gregory Nutt
74189d84e2 Cancellation points: Fix some backward logic in conditional compilation. 2017-02-02 06:42:41 -06:00
Gregory Nutt
e0f199e42e Missing semicolon in previous commit 2017-01-31 14:18:20 -06:00
Gregory Nutt
154873a3d0 Timer logic: Add private function prototypes to eliminate a warning; Functions should not be inline because the may recurse. 2017-01-31 13:45:22 -06:00
Gregory Nutt
e30b2617e3 Shared Libs: Implement module based shared libraries for the PROTECTED mode build 2017-01-29 13:03:53 -06:00
Gregory Nutt
2c45f482b1 Module names are not needed in libc/modlib when the module library is used only for shared library support. 2017-01-29 12:23:24 -06:00
Gregory Nutt
86bdd0a4c7 Modules: Move last of many C files from sched/module to libc/modlib 2017-01-29 11:54:54 -06:00
Gregory Nutt
6da66fb5c8 Modules: Move next five of many C files from sched/module to libc/modlib 2017-01-29 11:17:29 -06:00
Gregory Nutt
5e94dd22bb Modules: Move first five of many C files from sched/module to libc/modlib 2017-01-29 10:05:15 -06:00
Gregory Nutt
00e46b5966 Move gnu-elf.ld from sched/module to libc/modlib. Update paths in Make.defs files to account for new location of file 2017-01-29 09:03:01 -06:00
Gregory Nutt
2717e781f0 libc/modlib: Add build a configuration logic for a shared module library. 2017-01-29 08:55:27 -06:00
Gregory Nutt
b79ca9dcdd Modules: Move sched/module/module.h to include/nuttx/lib/modlib.h 2017-01-29 08:24:42 -06:00
Gregory Nutt
68a7110195 sched/modules: Add support for dependencies between modules. 2017-01-27 11:43:27 -06:00
Gregory Nutt
6a4880f415 SMP: Fix timer related issues: Round robin and sporadic scheduling were only being performed for tasks running on the CPU that processes the system timer interrupt. Similary, CPU load measurements were only be processed for running on the CPU that receives the sampling interrupt. 2017-01-23 12:14:01 -06:00
Gregory Nutt
4574a1ca42 Modules: Extend the module interface so that we can access symbols exported by the module. 2017-01-22 14:26:22 -06:00
Gregory Nutt
d90e66a024 Kernel Modules: Module initializer may now return a symbol table (not yet used for anything) 2017-01-22 11:37:49 -06:00
Gregory Nutt
1823c78663 Update some comments 2017-01-22 10:17:51 -06:00
Gregory Nutt
686041f8e7 CPU load: Correct computation of the nominal period to use when the source is a oneshot timer. 2017-01-22 07:12:22 -06:00
rg
1e38884088 Fix a compile error: in sched_cpuload.c:Line136, the variables ts and secs are not defined if CONFIG_CPULOAD_ONESHOT_ENTROPY = 0. However, these variables are used regardless of CONFIG_CPULOAD_ONESHOT_ENTROPY at lines~180:onwards. 2017-01-22 06:48:11 -06:00
Gregory Nutt
edd9186540 ELF: Move ARMv7-A and ARMv7-R versions of ELF relocation logic to libc/machine 2017-01-21 14:40:26 -06:00
Gregory Nutt
fba247b119 Update some comments 2017-01-13 16:32:09 -06:00
Gregory Nutt
99bb2dda5d i.MX6: Corrects behavior of last SMP patch with i.MX6 2017-01-13 12:29:57 -06:00
Gregory Nutt
a51b5b7e17 Add REVISIT to comments. 2017-01-13 09:40:17 -06:00
Gregory Nutt
37e6e6a52e Eliminate a warning 2017-01-13 06:56:13 -06:00
Gregory Nutt
9ce4022096 SMP: Fix an error in critical section logic when performing a context switch from an interrupt handler. The g_cpu_irqset bit was not being set for the CPU so other CPUs did not know about the critical section. 2017-01-13 06:48:10 -06:00
Masayuki Ishikawa
acbfa47f70 sched_note: Fix spinlock instrumentation 2017-01-12 08:04:28 -06:00
Gregory Nutt
d5b1ca14e2 Update README and some comments. 2017-01-02 13:54:07 -06:00
Gregory Nutt
04557a1198 Eliminate a warning 2016-12-31 14:47:32 -06:00
Gregory Nutt
8f716a386b SMP: Use irq_cpu_locked() in sched_removereadytorun() and sched_setpriority() 2016-12-29 10:40:58 -06:00
Gregory Nutt
af92a67fc5 SMP: Use irq_cpu_locked() in sched_mergepending() 2016-12-29 08:53:31 -06:00
Gregory Nutt
e7d2b9f0e8 SMP: Move sharable function to common file as irq_cpu_locked(). Use irq_cpu_locked() in sched_unlock() 2016-12-29 08:17:10 -06:00
Gregory Nutt
96394f339e SMP: Fix a gap where we may try to make modifications to the task lists without being in a critical sections. That permits concurrent access to the tasks lists and many subtle problems. This fix just remains in the critical section throughout the operation (and possible until the task is restore in the event of a context switch). Makes a big difference in stability 2016-12-28 13:58:24 -06:00
Gregory Nutt
88da65ad8a sched_cpulocked: Avoid use of spinlock. That has been reported to cause a deadlock. 2016-12-28 12:10:17 -06:00
Gregory Nutt
72490f84e6 SMP: Make checks for CPU lock set more robust. There are certains conditions early in initialization on during interrupt handling where things need to be done a little differently. 2016-12-28 10:21:05 -06:00
Gregory Nutt
cfb876263a SMP: There were certain conditions that we must avoid by preventing releasing the pending tasks while withn a critical section. But this logic was incomplete; there was no logic to prevent other CPUs from adding new, running tasks while on CPU is in a critical section. 
This commit corrects this.  This is matching logic in sched_addreadytorun to avoid starting new tasks within the critical section (unless the CPU is the holder of the lock).  The holder of the IRQ lock must be permitted to do whatever it needs to do.
 2016-12-27 08:49:07 -06:00
Gregory Nutt
e0f3f4ae19 Update some coments 2016-12-26 16:12:27 -06:00
Gregory Nutt
849a5dc2a9 SMP: Enforce this rule: Tasks which are normally restored when sched_unlock() is called must remain pending (1) if we are in a critical section, i.e., g_cpu_irqlock is locked , or (2) other CPUs still have pre-emption disabled, i.e., g_cpu_schedlock is locked. In those cases, the release of the pending tasks must be deferred until those conditions are met. 2016-12-26 08:15:02 -06:00
Gregory Nutt
d45a81d643 Revert "SMP: Fix a error introduced in 36b676eea6 and fully decouple disabling of pre-emption from critical sections." 
This reverts commit 9aedf1bdec.
 2016-12-26 07:48:22 -06:00
Gregory Nutt
9aedf1bdec SMP: Fix a error introduced in 36b676eea6 and fully decouple disabling of pre-emption from critical sections. 2016-12-25 06:54:43 -06:00
Gregory Nutt
efb86382c3 SMP: Back out deferred IRQ locking. This was accidentally merged into master and it looks like it is going to be more work than I thought to get it working again. Changes will go to the irqlock branch. 2016-12-24 19:53:37 -06:00
Gregory Nutt
3af6b2a9a6 Update a comment 2016-12-24 19:01:07 -06:00
Gregory Nutt
f55bad863b SMP: Fix logic error in last change: Deferred restoration of IRQ lock only applies if the context switch was on this CPU. 2016-12-24 18:52:58 -06:00
Gregory Nutt
36b676eea6 SMP sched_unlock: Should merging depend on g_cpu_irqlock or not? Let's at least be consistent. And don't use irqcount; use g_cpu_irqlock. 2016-12-24 13:45:11 -06:00
Gregory Nutt
d75a7643d0 Fix a trivial typo 2016-12-23 13:01:20 -06:00
Gregory Nutt
e6fff09ef8 Implement deferred IRQ locking. So far only form ARMv7-M. 2016-12-23 07:55:41 -06:00
Gregory Nutt
d648f9c8b4 Add task_testcancel() 2016-12-10 16:34:14 -06:00
Gregory Nutt
f132960789 Add task_setcanceltype() 2016-12-10 16:06:14 -06:00
Gregory Nutt
5fb207eb36 Add task_setcancelstate() 2016-12-10 15:16:46 -06:00
Gregory Nutt
698597a838 task_delete() now obeys all cancellation point semantics. 2016-12-10 14:39:19 -06:00
Gregory Nutt
6997cda1b5 Grrr... cloned typos! 2016-12-10 09:45:55 -06:00
Gregory Nutt
842ec7e612 ifdef out some non-reachable code 2016-12-10 09:43:04 -06:00
Gregory Nutt
b52e4e5ecd Move cancellation point definitions to their own header file. 2016-12-10 09:08:26 -06:00
Gregory Nutt
bc3ca25cc7 Cancellation points: Close up some logic to eliminte some race conditions. 2016-12-10 08:36:58 -06:00
Gregory Nutt
e62b3bccd3 pthread_setcanceltype() and pthread_testcancel() do not have to be system calls if cancellation points are not enabled. 2016-12-10 07:40:48 -06:00
Gregory Nutt
a0f567f4a3 Update TODO, cosmetic changes, spelling -- US English spells it canceled and canceling vs cancelled and cancelling. No idea why. 2016-12-09 18:39:40 -06:00
Gregory Nutt
018eb7c1d2 Cancellation points no longer depend on EXPERIMENTAL 2016-12-09 17:44:37 -06:00
Gregory Nutt
a76e729b0d Trivial, cosmetic 2016-12-09 17:27:57 -06:00
Gregory Nutt
113d8bdcca Fix some SMP-related compilation errors 2016-12-09 17:10:59 -06:00
Gregory Nutt
78cdc9f113 Fix a typo in a debug assertion. 2016-12-09 16:59:10 -06:00
Gregory Nutt
7ee0862e67 Merge remote-tracking branch 'origin/master' into cancelpt 2016-12-09 16:54:15 -06:00
Gregory Nutt
b07964461e pthread_mutex_destroy(): Fix an error in destorynig a mutex which can occur after a pthread has been canceled while holding the mutex. 2016-12-09 16:53:29 -06:00
Gregory Nutt
7fce8022c6 Finishes all cancellation point logic 2016-12-09 16:50:34 -06:00
Gregory Nutt
d8783a7345 Update Documentation 2016-12-09 14:41:54 -06:00
Gregory Nutt
3eba0acb1c More cancellation points. 2016-12-09 13:49:36 -06:00
Gregory Nutt
c9ca97b4b5 cancellation points are basically function. More tested is needed and additional cancellation points must be implemented before this can be merged back to master. 2016-12-09 12:01:18 -06:00
Gregory Nutt
018db84567 Flesh out more cancellation point logic. 2016-12-09 10:31:40 -06:00
Gregory Nutt
d35e589d56 Flesh basic cancellation point support 2016-12-09 09:44:23 -06:00
Gregory Nutt
82a79b9c1b Add framework for cancellation point support. 2016-12-09 08:13:28 -06:00
Gregory Nutt
acaae12e8b Add pthread_testcancel(), pthread_testcancel(), and definitiions for cancellation types. 2016-12-09 07:23:00 -06:00
Gregory Nutt
6224e47533 pthread cleanup stack: Replace critical section with sched_lock/unlock(). The cleanup stack modification only needs to have the TCB stationary. The stack is never modified from interrupt level logic 2016-12-08 14:33:02 -06:00
Gregory Nutt
ab43681f15 Update TODO and some comments. 2016-12-08 10:24:40 -06:00
Gregory Nutt
a1fbc2ad0d pthreads: Add pthread_cleanup_push() and pthread_cleanup_pop() 2016-12-08 09:27:13 -06:00
Gregory Nutt
7632dfd6c7 Update some comments. 2016-12-08 07:52:02 -06:00
Gregory Nutt
a7b688e87b sched notes: Add additional note to see if/when CPU is started in SMP mode. 2016-12-07 09:08:20 -06:00
Gregory Nutt
9ed0387379 Olimex-LPC1766-STK: Enable procfs in NSH configuration. Automount /proc on startup. 2016-12-05 08:52:40 -06:00
Masayuki Ishikawa
13c9031a8d Fix DEBUGASSERT() in group_signal.c 2016-12-04 06:52:08 -06:00
Gregory Nutt
b78c3fcc30 Finish backing out previous change 2016-11-30 08:13:43 -06:00
Gregory Nutt
e6eb2e8bfa Back out the last change. I just noticed some complexities that need to be verified before this is released onto the world. 2016-11-30 07:41:48 -06:00
Gregory Nutt
8453343426 scheduler instrumentation: Add a little more protection for the SMP case 2016-11-30 07:24:15 -06:00
Gregory Nutt
9ee3f3b933 sched_note: Permit spinlock and critical section notes in in-memory buffer iff sched_not_get() interfaces is disabled. 2016-11-28 18:36:26 -06:00
Gregory Nutt
00215fbc98 sched_note: Add spinlock instrumentation; In SMP configurations, select to log only notes from certain CPUs 2016-11-28 10:33:46 -06:00
Gregory Nutt
d65be718c2 sched_note: Extend OS instrumentation to include some SMP events. 2016-11-27 17:14:57 -06:00
Gregory Nutt
e3fe320e08 SMP: Add support for linking spinlocks into a special, non-cached memory region. 2016-11-26 08:47:03 -06:00
Gregory Nutt
1d06e786e1 SMP: Clean-up and simplication of logic that I implemented late last night. 2016-11-26 07:05:27 -06:00
Gregory Nutt
a0e1af2614 SMP: Fix yet another potential deadlock 2016-11-25 23:04:27 -06:00
Gregory Nutt
eb9f8074c0 Update comments 2016-11-24 09:56:43 -06:00
Gregory Nutt
7bec4ffeec Update some comments 2016-11-23 17:40:01 -06:00
Gregory Nutt
d4037a30aa Update some comments 2016-11-23 13:20:18 -06:00
Gregory Nutt
f90525a5d1 SMP: Update some comments; trivial improvement by inlining static function. 2016-11-22 16:48:57 -06:00
Gregory Nutt
bac7153609 SMP: Add logic to avoid a deadlock condition when CPU1 is hung waiting for g_cpu_irqlock and CPU0 is waitin for g_cpu_paused 2016-11-22 11:34:16 -06:00
Gregory Nutt
130bfa3f6b Remove a assertion condition that appears to rarely cause false-alarm assertions. Teported by Petteri Aimonen 2016-11-21 14:43:56 -06:00
Gregory Nutt
558784d06f Spinlocks: Added capability to provide architecture-specific memory barriers. This was for i.MX6 but does not help with the SMP problems. It is still a good feature. 2016-11-21 11:55:59 -06:00
Gregory Nutt
2d1765a014 Remove more of those annoying empty comment blocks. 2016-11-21 07:34:27 -06:00
Gregory Nutt
0029c04dad task_restart: Make sure new task starts with pre-emption disabled and not in a critical section. 2016-11-21 07:33:23 -06:00
Gregory Nutt
cee8d59b58 Update TODO list 2016-11-20 12:26:08 -06:00
Gregory Nutt
e24f281401 This commit adds a new internal interfaces and fixes a problem with three APIs in the SMP configuration. The new internal interface is sched_cpu_pause(tcb). This function will pause a CPU if the task associated with 'tcb' is running on that CPU. This allows a different CPU to modify that OS data stuctures associated with the CPU. When the other CPU is resumed, those modifications can safely take place. 
The three fixes are to handle cases in the SMP configuration where one CPU does need to make modifications to TCB and data structures on a task that could be running running on another CPU.  Those three cases are task_delete(), task_restart(), and execution of signal handles.  In all three cases the solutions is basically the same:  (1) Call sched_cpu_pause(tcb) to pause the CPU on which the task is running, (2) perform the necessary operations, then (3) call up_cpu_resume() to restart the paused CPU.
 2016-11-20 07:57:18 -06:00
Gregory Nutt
f40fbaa4b9 sched/task: task_restart() test not supported on SMP systems. This is not fully implemented. 2016-11-19 11:41:05 -06:00
Rajan Gill
0d8e191d69 sched/clock: Correct calculation for the case of Tickless mode with a 32-bit timer. In that case, the calculation was returning millisecond accuracy. That is not good when the timer accuracy is < 1 msec. 2016-11-19 09:55:21 -06:00
Gregory Nutt
5ca9128c38 Update comments 2016-11-19 08:33:55 -06:00