sys.h File Reference

#include "lwip/opt.h"
#include "lwip/err.h"
#include "arch/sys_arch.h"

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Macros
#define	SYS_ARCH_TIMEOUT   0xffffffffUL
#define	SYS_MBOX_EMPTY   SYS_ARCH_TIMEOUT
#define	sys_sem_wait(sem)   sys_arch_sem_wait(sem, 0)
#define	sys_mbox_tryfetch(mbox, msg)   sys_arch_mbox_tryfetch(mbox, msg)
#define	sys_mbox_fetch(mbox, msg)   sys_arch_mbox_fetch(mbox, msg, 0)
#define	SYS_ARCH_DECL_PROTECT(lev)
#define	SYS_ARCH_PROTECT(lev)
#define	SYS_ARCH_UNPROTECT(lev)
#define	SYS_ARCH_INC(var, val)
#define	SYS_ARCH_DEC(var, val)
#define	SYS_ARCH_GET(var, ret)
#define	SYS_ARCH_SET(var, val)

Typedefs
typedef void(*	lwip_thread_fn) (void *arg)

Functions
err_t	sys_mutex_new (sys_mutex_t *mutex)
void	sys_mutex_lock (sys_mutex_t *mutex)
void	sys_mutex_unlock (sys_mutex_t *mutex)
void	sys_mutex_free (sys_mutex_t *mutex)
int	sys_mutex_valid (sys_mutex_t *mutex)
void	sys_mutex_set_invalid (sys_mutex_t *mutex)
err_t	sys_sem_new (sys_sem_t *sem, u8_t count)
void	sys_sem_signal (sys_sem_t *sem)
u32_t	sys_arch_sem_wait (sys_sem_t *sem, u32_t timeout)
void	sys_sem_free (sys_sem_t *sem)
int	sys_sem_valid (sys_sem_t *sem)
void	sys_sem_set_invalid (sys_sem_t *sem)
void	sys_msleep (u32_t ms)
err_t	sys_mbox_new (sys_mbox_t *mbox, int size)
void	sys_mbox_post (sys_mbox_t *mbox, void *msg)
err_t	sys_mbox_trypost (sys_mbox_t *mbox, void *msg)
u32_t	sys_arch_mbox_fetch (sys_mbox_t *mbox, void **msg, u32_t timeout)
u32_t	sys_arch_mbox_tryfetch (sys_mbox_t *mbox, void **msg)
void	sys_mbox_free (sys_mbox_t *mbox)
int	sys_mbox_valid (sys_mbox_t *mbox)
void	sys_mbox_set_invalid (sys_mbox_t *mbox)
sys_thread_t	sys_thread_new (const char *name, lwip_thread_fn thread, void *arg, int stacksize, int prio)
void	sys_init (void)
u32_t	sys_jiffies (void)
u32_t	sys_now (void)

Macro Definition Documentation

SYS_ARCH_DEC

#define SYS_ARCH_DEC	(		var,
			val
	)

Value:

                                do { \
                                SYS_ARCH_DECL_PROTECT(old_level); \
                                SYS_ARCH_PROTECT(old_level); \
                                var -= val; \
                                SYS_ARCH_UNPROTECT(old_level); \
                              } while(0)

Definition at line 306 of file sys.h.

SYS_ARCH_DECL_PROTECT

#define SYS_ARCH_DECL_PROTECT

(

lev

)

SYS_LIGHTWEIGHT_PROT define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection for certain critical regions during buffer allocation, deallocation and memory allocation and deallocation.

Definition at line 283 of file sys.h.

SYS_ARCH_GET

#define SYS_ARCH_GET	(		var,
			ret
	)

Value:

                                do { \
                                SYS_ARCH_DECL_PROTECT(old_level); \
                                SYS_ARCH_PROTECT(old_level); \
                                ret = var; \
                                SYS_ARCH_UNPROTECT(old_level); \
                              } while(0)

Definition at line 315 of file sys.h.

SYS_ARCH_INC

#define SYS_ARCH_INC	(		var,
			val
	)

Value:

                                do { \
                                SYS_ARCH_DECL_PROTECT(old_level); \
                                SYS_ARCH_PROTECT(old_level); \
                                var += val; \
                                SYS_ARCH_UNPROTECT(old_level); \
                              } while(0)

Definition at line 297 of file sys.h.

SYS_ARCH_PROTECT

#define SYS_ARCH_PROTECT

(

lev

)

Definition at line 284 of file sys.h.

SYS_ARCH_SET

#define SYS_ARCH_SET	(		var,
			val
	)

Value:

                                do { \
                                SYS_ARCH_DECL_PROTECT(old_level); \
                                SYS_ARCH_PROTECT(old_level); \
                                var = val; \
                                SYS_ARCH_UNPROTECT(old_level); \
                              } while(0)

Definition at line 324 of file sys.h.

SYS_ARCH_TIMEOUT

#define SYS_ARCH_TIMEOUT   0xffffffffUL

Return code for timeouts from sys_arch_mbox_fetch and sys_arch_sem_wait

Definition at line 78 of file sys.h.

SYS_ARCH_UNPROTECT

#define SYS_ARCH_UNPROTECT

(

lev

)

Definition at line 285 of file sys.h.

SYS_MBOX_EMPTY

#define SYS_MBOX_EMPTY   SYS_ARCH_TIMEOUT

sys_mbox_tryfetch() returns SYS_MBOX_EMPTY if appropriate. For now we use the same magic value, but we allow this to change in future.

Definition at line 83 of file sys.h.

sys_mbox_fetch

#define sys_mbox_fetch	(		mbox,
			msg
	)		sys_arch_mbox_fetch(mbox, msg, 0)

Definition at line 207 of file sys.h.

sys_mbox_tryfetch

#define sys_mbox_tryfetch	(		mbox,
			msg
	)		sys_arch_mbox_tryfetch(mbox, msg)

For now, we map straight to sys_arch implementation.

Definition at line 203 of file sys.h.

sys_sem_wait

#define sys_sem_wait

(

sem

)

sys_arch_sem_wait(sem, 0)

Wait for a semaphore - forever/no timeout

Definition at line 153 of file sys.h.

Typedef Documentation

lwip_thread_fn

typedef void(* lwip_thread_fn) (void *arg)

Function prototype for thread functions

Definition at line 89 of file sys.h.

Function Documentation

sys_arch_mbox_fetch()

u32_t sys_arch_mbox_fetch	(	sys_mbox_t *	mbox,
		void **	msg,
		u32_t	timeout
	)

Wait for a new message to arrive in the mbox

Parameters

mbox	mbox to get a message from
msg	pointer where the message is stored
timeout	maximum time (in milliseconds) to wait for a message

Returns

time (in milliseconds) waited for a message, may be 0 if not waited or SYS_ARCH_TIMEOUT on timeout The returned time has to be accurate to prevent timer jitter!

Definition at line 177 of file sys_arch.c.

{
    LARGE_INTEGER LargeTimeout, PreWaitTime, PostWaitTime;
    UINT64 TimeDiff;
    NTSTATUS Status;
    PVOID Message;
    PLWIP_MESSAGE_CONTAINER Container;
    PLIST_ENTRY Entry;
    KIRQL OldIrql;
    PVOID WaitObjects[] = {&mbox->Event, &TerminationEvent};
 
    LargeTimeout.QuadPart = Int32x32To64(timeout, -10000);
 
    KeQuerySystemTime(&PreWaitTime);
 
    Status = KeWaitForMultipleObjects(2,
                                      WaitObjects,
                                      WaitAny,
                                      Executive,
                                      KernelMode,
                                      FALSE,
                                      timeout != 0 ? &LargeTimeout : NULL,
                                      NULL);
 
    if (Status == STATUS_WAIT_0)
    {
        KeAcquireSpinLock(&mbox->Lock, &OldIrql);
        Entry = RemoveHeadList(&mbox->ListHead);
        ASSERT(Entry);
        if (IsListEmpty(&mbox->ListHead))
            KeClearEvent(&mbox->Event);
        KeReleaseSpinLock(&mbox->Lock, OldIrql);
 
        Container = CONTAINING_RECORD(Entry, LWIP_MESSAGE_CONTAINER, ListEntry);
        Message = Container->Message;
        ExFreePool(Container);
 
        if (msg)
            *msg = Message;
 
        KeQuerySystemTime(&PostWaitTime);
        TimeDiff = PostWaitTime.QuadPart - PreWaitTime.QuadPart;
        TimeDiff /= 10000;
 
        return TimeDiff;
    }
    else if (Status == STATUS_WAIT_1)
    {
        /* DON'T remove ourselves from the thread list! */
        PsTerminateSystemThread(STATUS_SUCCESS);
 
        /* We should never get here! */
        ASSERT(FALSE);
 
        return 0;
    }
 
    return SYS_ARCH_TIMEOUT;
}

Referenced by sys_arch_mbox_tryfetch().

sys_arch_mbox_tryfetch()

u32_t sys_arch_mbox_tryfetch	(	sys_mbox_t *	mbox,
		void **	msg
	)

Wait for a new message to arrive in the mbox

Parameters

mbox	mbox to get a message from
msg	pointer where the message is stored
timeout	maximum time (in milliseconds) to wait for a message

Returns

0 (milliseconds) if a message has been received or SYS_MBOX_EMPTY if the mailbox is empty

Definition at line 238 of file sys_arch.c.

{
    if (sys_arch_mbox_fetch(mbox, msg, 1) != SYS_ARCH_TIMEOUT)
        return 0;
    else
        return SYS_MBOX_EMPTY;
}

sys_arch_sem_wait()

u32_t sys_arch_sem_wait	(	sys_sem_t *	sem,
		u32_t	timeout
	)

Wait for a semaphore for the specified timeout

Parameters

sem	the semaphore to wait for
timeout	timeout in milliseconds to wait (0 = wait forever)

Returns

time (in milliseconds) waited for the semaphore or SYS_ARCH_TIMEOUT on timeout

Definition at line 86 of file sys_arch.c.

{
    LARGE_INTEGER LargeTimeout, PreWaitTime, PostWaitTime;
    UINT64 TimeDiff;
    NTSTATUS Status;
    PVOID WaitObjects[] = {&sem->Event, &TerminationEvent};
 
    LargeTimeout.QuadPart = Int32x32To64(timeout, -10000);
 
    KeQuerySystemTime(&PreWaitTime);
 
    Status = KeWaitForMultipleObjects(2,
                                      WaitObjects,
                                      WaitAny,
                                      Executive,
                                      KernelMode,
                                      FALSE,
                                      timeout != 0 ? &LargeTimeout : NULL,
                                      NULL);
    if (Status == STATUS_WAIT_0)
    {
        KeQuerySystemTime(&PostWaitTime);
        TimeDiff = PostWaitTime.QuadPart - PreWaitTime.QuadPart;
        TimeDiff /= 10000;
 
        return TimeDiff;
    }
    else if (Status == STATUS_WAIT_1)
    {
        /* DON'T remove ourselves from the thread list! */
        PsTerminateSystemThread(STATUS_SUCCESS);
 
        /* We should never get here! */
        ASSERT(FALSE);
 
        return 0;
    }
 
    return SYS_ARCH_TIMEOUT;
}

Referenced by sys_msleep().

sys_init()

void sys_init

(

void

)

Definition at line 305 of file sys_arch.c.

{
    KeInitializeSpinLock(&ThreadListLock);
    InitializeListHead(&ThreadListHead);
 
    KeQuerySystemTime(&StartTime);
 
    KeInitializeEvent(&TerminationEvent, NotificationEvent, FALSE);
 
    ExInitializeNPagedLookasideList(&MessageLookasideList,
                                    NULL,
                                    NULL,
                                    0,
                                    sizeof(struct lwip_callback_msg),
                                    LWIP_MESSAGE_TAG,
                                    0);
 
    ExInitializeNPagedLookasideList(&QueueEntryLookasideList,
                                    NULL,
                                    NULL,
                                    0,
                                    sizeof(QUEUE_ENTRY),
                                    LWIP_QUEUE_TAG,
                                    0);
}

Referenced by lwip_init().

sys_jiffies()

u32_t sys_jiffies

(

void

)

Ticks/jiffies since power up.

sys_mbox_free()

void sys_mbox_free

(

sys_mbox_t *

mbox

)

Delete an mbox

Parameters

mbox	mbox to delete

Definition at line 152 of file sys_arch.c.

{
    ASSERT(IsListEmpty(&mbox->ListHead));
 
    sys_mbox_set_invalid(mbox);
}

sys_mbox_new()

err_t sys_mbox_new	(	sys_mbox_t *	mbox,
		int	size
	)

Create a new mbox of specified size

Parameters

mbox	pointer to the mbox to create
size	(miminum) number of messages in this mbox

Returns

ERR_OK if successful, another err_t otherwise

Definition at line 128 of file sys_arch.c.

{
    KeInitializeSpinLock(&mbox->Lock);
 
    InitializeListHead(&mbox->ListHead);
 
    KeInitializeEvent(&mbox->Event, NotificationEvent, FALSE);
 
    mbox->Valid = 1;
 
    return ERR_OK;
}

Referenced by tcpip_init().

sys_mbox_post()

void sys_mbox_post	(	sys_mbox_t *	mbox,
		void *	msg
	)

Post a message to an mbox - may not fail -> blocks if full, only used from tasks not from ISR

Parameters

mbox	mbox to posts the message
msg	message to post (ATTENTION: can be NULL)

Definition at line 160 of file sys_arch.c.

{
    PLWIP_MESSAGE_CONTAINER Container;
 
    Container = ExAllocatePool(NonPagedPool, sizeof(*Container));
    ASSERT(Container);
 
    Container->Message = msg;
 
    ExInterlockedInsertTailList(&mbox->ListHead,
                                &Container->ListEntry,
                                &mbox->Lock);
 
    KeSetEvent(&mbox->Event, IO_NO_INCREMENT, FALSE);
}

Referenced by sys_mbox_trypost(), and tcpip_callback_with_block().

sys_mbox_set_invalid()

void sys_mbox_set_invalid

(

sys_mbox_t *

mbox

)

Set an mbox invalid so that sys_mbox_valid returns 0

Definition at line 146 of file sys_arch.c.

{
    mbox->Valid = 0;
}

Referenced by sys_mbox_free().

sys_mbox_trypost()

err_t sys_mbox_trypost	(	sys_mbox_t *	mbox,
		void *	msg
	)

Try to post a message to an mbox - may fail if full or ISR

Parameters

mbox	mbox to posts the message
msg	message to post (ATTENTION: can be NULL)

Definition at line 247 of file sys_arch.c.

{
    sys_mbox_post(mbox, msg);
 
    return ERR_OK;
}

Referenced by tcpip_callback_with_block(), tcpip_input(), and tcpip_trycallback().

sys_mbox_valid()

int sys_mbox_valid

(

sys_mbox_t *

mbox

)

Check if an mbox is valid/allocated: return 1 for valid, 0 for invalid

Definition at line 141 of file sys_arch.c.

{
    return mbox->Valid;
}

Referenced by tcpip_callback_with_block(), tcpip_input(), and tcpip_trycallback().

sys_msleep()

void sys_msleep

(

u32_t

ms

)

Sleep for some ms. Timeouts are NOT processed while sleeping.

Parameters

ms	number of milliseconds to sleep

Definition at line 55 of file sys.c.

{
  if (ms > 0) {
    sys_sem_t delaysem;
    err_t err = sys_sem_new(&delaysem, 0);
    if (err == ERR_OK) {
      sys_arch_sem_wait(&delaysem, ms);
      sys_sem_free(&delaysem);
    }
  }
}

sys_mutex_free()

void sys_mutex_free

(

sys_mutex_t *

mutex

)

Delete a semaphore

Parameters

mutex

the mutex to delete

sys_mutex_lock()

void sys_mutex_lock

(

sys_mutex_t *

mutex

)

Lock a mutex

Parameters

mutex

the mutex to lock

Referenced by mem_malloc().

sys_mutex_new()

err_t sys_mutex_new

(

sys_mutex_t *

mutex

)

Define LWIP_COMPAT_MUTEX if the port has no mutexes and binary semaphores should be used instead Create a new mutex

Parameters

mutex

pointer to the mutex to create

Returns

a new mutex

Referenced by mem_init(), and tcpip_init().

sys_mutex_set_invalid()

void sys_mutex_set_invalid

(

sys_mutex_t *

mutex

)

Set a mutex invalid so that sys_mutex_valid returns 0

sys_mutex_unlock()

void sys_mutex_unlock

(

sys_mutex_t *

mutex

)

Unlock a mutex

Parameters

mutex

the mutex to unlock

Referenced by mem_malloc().

sys_mutex_valid()

int sys_mutex_valid

(

sys_mutex_t *

mutex

)

Check if a mutex is valid/allocated: return 1 for valid, 0 for invalid

sys_now()

u32_t sys_now

(

void

)

Returns the current time in milliseconds, may be the same as sys_jiffies or at least based on it.

Definition at line 23 of file sys_arch.c.

{
    LARGE_INTEGER CurrentTime;
 
    KeQuerySystemTime(&CurrentTime);
 
    return (CurrentTime.QuadPart - StartTime.QuadPart) / 10000;
}

sys_sem_free()

void sys_sem_free

(

sys_sem_t *

sem

)

Delete a semaphore

Parameters

sem	semaphore to delete

Definition at line 72 of file sys_arch.c.

{
    /* No op (allocated in stack) */
 
    sys_sem_set_invalid(sem);
}

Referenced by sys_msleep().

sys_sem_new()

err_t sys_sem_new	(	sys_sem_t *	sem,
		u8_t	count
	)

Create a new semaphore

Parameters

sem	pointer to the semaphore to create
count	initial count of the semaphore

Returns

ERR_OK if successful, another err_t otherwise

Definition at line 46 of file sys_arch.c.

{
    ASSERT(count == 0 || count == 1);
 
    /* It seems lwIP uses the semaphore implementation as either a completion event or a lock
     * so I optimize for this case by using a synchronization event and setting its initial state
     * to signalled for a lock and non-signalled for a completion event */
 
    KeInitializeEvent(&sem->Event, SynchronizationEvent, count);
 
    sem->Valid = 1;
 
    return ERR_OK;
}

Referenced by sys_msleep().

sys_sem_set_invalid()

void sys_sem_set_invalid

(

sys_sem_t *

sem

)

Set a semaphore invalid so that sys_sem_valid returns 0

Definition at line 66 of file sys_arch.c.

{
    sem->Valid = 0;
}

Referenced by sys_sem_free().

sys_sem_signal()

void sys_sem_signal

(

sys_sem_t *

sem

)

Signals a semaphore

Parameters

sem	the semaphore to signal

Definition at line 80 of file sys_arch.c.

{
    KeSetEvent(&sem->Event, IO_NO_INCREMENT, FALSE);
}

sys_sem_valid()

int sys_sem_valid

(

sys_sem_t *

sem

)

Check if a sempahore is valid/allocated: return 1 for valid, 0 for invalid

Definition at line 61 of file sys_arch.c.

{
    return sem->Valid;
}

sys_thread_new()

sys_thread_t sys_thread_new	(	const char *	name,
		lwip_thread_fn	thread,
		void *	arg,
		int	stacksize,
		int	prio
	)

The only thread function: Creates a new thread

Parameters

name	human-readable name for the thread (used for debugging purposes)
thread	thread-function
arg	parameter passed to 'thread'
stacksize	stack size in bytes for the new thread (may be ignored by ports)
prio	priority of the new thread (may be ignored by ports)

Definition at line 275 of file sys_arch.c.

{
    thread_t Container;
    NTSTATUS Status;
 
    Container = ExAllocatePool(NonPagedPool, sizeof(*Container));
    if (!Container)
        return 0;
 
    Container->ThreadFunction = thread;
    Container->ThreadContext = arg;
 
    Status = PsCreateSystemThread(&Container->Handle,
                                  THREAD_ALL_ACCESS,
                                  NULL,
                                  NULL,
                                  NULL,
                                  LwipThreadMain,
                                  Container);
 
    if (!NT_SUCCESS(Status))
    {
        ExFreePool(Container);
        return 0;
    }
 
    return 0;
}

Referenced by tcpip_init().