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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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NAME="DEVAPI-SYNCHRONIZATION-LEVELS">Synchronization Levels</H1
><P
>Since it would be dangerous for an ISR or DSR to make a call
that might reschedule the current thread (by trying to lock a mutex
for example) all functions in this API have an associated synchronization
level. These levels are:</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Thread</DT
><DD
><P
>      This function may only be called from within threads. This is
      usually the client code that makes calls into the device driver.
      In a non-kernel configuration, this will be code running at the
      default non-interrupt level.
      </P
></DD
><DT
>DSR</DT
><DD
><P
>      This function may be called by either DSR or thread code.
      </P
></DD
><DT
>ISR</DT
><DD
><P
>      This function may be called from ISR, DSR or thread code.
      </P
></DD
></DL
></DIV
><P
>The following table shows, for each API function, the levels
at which is may be called:</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>                                  Callable from:
Function                       ISR     DSR    Thread
-------------------------------------------------------------------------
 
cyg_drv_isr_lock                X       X       X
cyg_drv_isr_unlock              X       X       X
cyg_drv_spinlock_init                           X
cyg_drv_spinlock_destroy                        X
cyg_drv_spinlock_spin           X       X       X
cyg_drv_spinlock_clear          X       X       X
cyg_drv_spinlock_try            X       X       X
cyg_drv_spinlock_test           X       X       X
cyg_drv_spinlock_spin_intsave   X       X       X
cyg_drv_spinlock_clear_intsave  X       X       X
cyg_drv_dsr_lock                        X       X
cyg_drv_dsr_unlock                      X       X
cyg_drv_mutex_init                              X
cyg_drv_mutex_destroy                           X
cyg_drv_mutex_lock                              X
cyg_drv_mutex_trylock                           X
cyg_drv_mutex_unlock                            X
cyg_drv_mutex_release                           X
cyg_drv_cond_init                               X
cyg_drv_cond_destroy                            X
cyg_drv_cond_wait                               X
cyg_drv_cond_signal                     X       X
cyg_drv_cond_broadcast                  X       X
cyg_drv_interrupt_create                        X
cyg_drv_interrupt_delete                        X
cyg_drv_interrupt_attach        X       X       X
cyg_drv_interrupt_detach        X       X       X
cyg_drv_interrupt_mask          X       X       X
cyg_drv_interrupt_unmask        X       X       X
cyg_drv_interrupt_acknowledge   X       X       X
cyg_drv_interrupt_configure     X       X       X
cyg_drv_interrupt_level         X       X       X
cyg_drv_interrupt_set_cpu       X       X       X
cyg_drv_interrupt_get_cpu       X       X       X&#13;</PRE
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1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
5			`<!-- http://www.opencontent.org/openpub/). -->`
6			`<!-- Distribution of the work or derivative of the work in any -->`
7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>Synchronization Levels</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
14			`<META`
15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
17			`"><LINK`
18			`REL="HOME"`
19			`TITLE="eCos Reference Manual"`
20			`HREF="ecos-ref.html"><LINK`
21			`REL="UP"`
22			`TITLE="Device Driver Interface to the Kernel"`
23			`HREF="devapi-device-driver-interface-to-the-kernel.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="Device Driver Models"`
26			`HREF="devapi-device-driver-models.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="The API"`
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47			`COLSPAN="3"`
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49			`>eCos Reference Manual</TH`
50			`></TR`
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52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
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57			`HREF="devapi-device-driver-models.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`>Chapter 18. Device Driver Interface to the Kernel</TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
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80			`><DIV`
81			`CLASS="SECTION"`
82			`><H1`
83			`CLASS="SECTION"`
84			`><A`
85			`NAME="DEVAPI-SYNCHRONIZATION-LEVELS">Synchronization Levels</H1`
86			`><P`
87			`>Since it would be dangerous for an ISR or DSR to make a call`
88			`that might reschedule the current thread (by trying to lock a mutex`
89			`for example) all functions in this API have an associated synchronization`
90			`level. These levels are:</P`
91			`><P`
92			`></P`
93			`><DIV`
94			`CLASS="VARIABLELIST"`
95			`><DL`
96			`><DT`
97			`>Thread</DT`
98			`><DD`
99			`><P`
100			`> This function may only be called from within threads. This is`
101			`usually the client code that makes calls into the device driver.`
102			`In a non-kernel configuration, this will be code running at the`
103			`default non-interrupt level.`
104			`</P`
105			`></DD`
106			`><DT`
107			`>DSR</DT`
108			`><DD`
109			`><P`
110			`> This function may be called by either DSR or thread code.`
111			`</P`
112			`></DD`
113			`><DT`
114			`>ISR</DT`
115			`><DD`
116			`><P`
117			`> This function may be called from ISR, DSR or thread code.`
118			`</P`
119			`></DD`
120			`></DL`
121			`></DIV`
122			`><P`
123			`>The following table shows, for each API function, the levels`
124			`at which is may be called:</P`
125			`><TABLE`
126			`BORDER="5"`
127			`BGCOLOR="#E0E0F0"`
128			`WIDTH="70%"`
129			`><TR`
130			`><TD`
131			`><PRE`
132			`CLASS="PROGRAMLISTING"`
133			`> Callable from:`
134			`Function ISR DSR Thread`
135			`-------------------------------------------------------------------------`
136
137			`cyg_drv_isr_lock X X X`
138			`cyg_drv_isr_unlock X X X`
139			`cyg_drv_spinlock_init X`
140			`cyg_drv_spinlock_destroy X`
141			`cyg_drv_spinlock_spin X X X`
142			`cyg_drv_spinlock_clear X X X`
143			`cyg_drv_spinlock_try X X X`
144			`cyg_drv_spinlock_test X X X`
145			`cyg_drv_spinlock_spin_intsave X X X`
146			`cyg_drv_spinlock_clear_intsave X X X`
147			`cyg_drv_dsr_lock X X`
148			`cyg_drv_dsr_unlock X X`
149			`cyg_drv_mutex_init X`
150			`cyg_drv_mutex_destroy X`
151			`cyg_drv_mutex_lock X`
152			`cyg_drv_mutex_trylock X`
153			`cyg_drv_mutex_unlock X`
154			`cyg_drv_mutex_release X`
155			`cyg_drv_cond_init X`
156			`cyg_drv_cond_destroy X`
157			`cyg_drv_cond_wait X`
158			`cyg_drv_cond_signal X X`
159			`cyg_drv_cond_broadcast X X`
160			`cyg_drv_interrupt_create X`
161			`cyg_drv_interrupt_delete X`
162			`cyg_drv_interrupt_attach X X X`
163			`cyg_drv_interrupt_detach X X X`
164			`cyg_drv_interrupt_mask X X X`
165			`cyg_drv_interrupt_unmask X X X`
166			`cyg_drv_interrupt_acknowledge X X X`
167			`cyg_drv_interrupt_configure X X X`
168			`cyg_drv_interrupt_level X X X`
169			`cyg_drv_interrupt_set_cpu X X X`
170			`cyg_drv_interrupt_get_cpu X X X </PRE`
171			`></TD`
172			`></TR`
173			`></TABLE`
174			`></DIV`
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219			`>Device Driver Models</TD`
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233			`>The API</TD`
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235			`></TABLE`
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238			`></HTML`
239			`>`

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